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Build a Picture from Simple Shapes - Practice 1 / Grade 1
Build a Picture from Simple Shapes - Practice 2 / Grade 1
Build a Picture from Shapes / Grade 2
Show Depth with Overlapping Shapes - Practice 1 / Grade 2
Show Depth with Overlapping Shapes - Practice 2 / Grade 2
Plan a Repeating Picture Border - Practice 1 / Grade 2
Plan a Repeating Picture Border - Practice 2 / Grade 2
Reflect a Mark across a Vertical Line - Practice 1 / Grade 3
Reflect a Mark across a Vertical Line - Practice 2 / Grade 3
Notice the Space around a Shape - Practice 1 / Grade 4
Notice the Space around a Shape - Practice 2 / Grade 4
Keep Proportions when Enlarging a Design - Practice 1 / Grade 5
Keep Proportions when Enlarging a Design - Practice 2 / Grade 5
Use Value and Overlap for Depth / Grade 6
Order a Labeled Value Scale - Practice 1 / Grade 6
Order a Labeled Value Scale - Practice 2 / Grade 6
Use One-Point Perspective as a Drawing Model - Practice 1 / Grade 7
Use One-Point Perspective as a Drawing Model - Practice 2 / Grade 7
Distinguish Flat Shapes from Solid Forms - Practice 1 / Grade 7
Distinguish Flat Shapes from Solid Forms - Practice 2 / Grade 7
Keep a Thumbnail Aspect Ratio - Practice 1 / Grade 8
Keep a Thumbnail Aspect Ratio - Practice 2 / Grade 8
Account for Positive and Negative Area - Practice 1 / Grade 9
Account for Positive and Negative Area - Practice 2 / Grade 9
Choose a Focal Treatment for a Stated Brief - Practice 1 / Grade 9
Choose a Focal Treatment for a Stated Brief - Practice 2 / Grade 9
Transfer a Design between Proportional Grids - Practice 1 / Grade 10
Transfer a Design between Proportional Grids - Practice 2 / Grade 10
Make a Visual Message Work without Color Alone - Practice 1 / Grade 10
Make a Visual Message Work without Color Alone - Practice 2 / Grade 10
Plan Time across Storyboard Panels - Practice 1 / Grade 11
Plan Time across Storyboard Panels - Practice 2 / Grade 11
Plan a Labeled Safe Area inside a Print - Practice 1 / Grade 11
Plan a Labeled Safe Area inside a Print - Practice 2 / Grade 11
Write an Honest Caption for a Visual Work - Practice 1 / Grade 12
Write an Honest Caption for a Visual Work - Practice 2 / Grade 12
Keep a Designed Chart Faithful to Its Data - Practice 1 / Grade 12
Keep a Designed Chart Faithful to Its Data - Practice 2 / Grade 12
Explore Straight, Curved and Zigzag Lines - Practice 1 / Kindergarten
Explore Straight, Curved and Zigzag Lines - Practice 2 / Kindergarten
Play with Straight and Curved Lines - Practice 1 / Pre-K
Play with Straight and Curved Lines - Practice 2 / Pre-K
Build a Picture with Shapes - Practice 1 / Pre-K
Build a Picture with Shapes - Practice 2 / Pre-K
Colors Have Names and Shades / Grade 1
Sort Colors with a Stated Palette Key - Practice 1 / Grade 1
Sort Colors with a Stated Palette Key - Practice 2 / Grade 1
Separate Tints and Shades in a Paint Model - Practice 1 / Grade 3
Separate Tints and Shades in a Paint Model - Practice 2 / Grade 3
Count a Deliberately Limited Palette - Practice 1 / Grade 4
Count a Deliberately Limited Palette - Practice 2 / Grade 4
Light Mixing Is Not Paint Mixing / Grade 5
Compare Additive Colored-Light Mixtures - Practice 1 / Grade 5
Compare Additive Colored-Light Mixtures - Practice 2 / Grade 5
Separate Hue, Value and Intensity - Practice 1 / Grade 6
Separate Hue, Value and Intensity - Practice 2 / Grade 6
Use Opposite Pairs on a Given Color Wheel - Practice 1 / Grade 8
Use Opposite Pairs on a Given Color Wheel - Practice 2 / Grade 8
Match Colors with Their Written Labels - Practice 1 / Kindergarten
Match Colors with Their Written Labels - Practice 2 / Kindergarten
Choose the Sense Named by a Detail - Practice 1 / Grade 1
Choose the Sense Named by a Detail - Practice 2 / Grade 1
Choose Details a Reader Can Sense / Grade 2
Choose a Verb for the Action You Mean - Practice 1 / Grade 2
Choose a Verb for the Action You Mean - Practice 2 / Grade 2
Choose Precise Story Details / Grade 3
Let Dialogue Do a Particular Job - Practice 1 / Grade 3
Let Dialogue Do a Particular Job - Practice 2 / Grade 3
Revise with Precise Verbs / Grade 4
Choose Details That Match a Scene / Grade 4
Replace a General Description with a Concrete Detail - Practice 1 / Grade 5
Replace a General Description with a Concrete Detail - Practice 2 / Grade 5
Suggest Emotion through Action without Claiming Certainty - Practice 1 / Grade 6
Suggest Emotion through Action without Claiming Certainty - Practice 2 / Grade 6
Choose Figurative Language for a Purpose / Grade 7
Choose Details That Serve a Scene Focus - Practice 1 / Grade 8
Choose Details That Serve a Scene Focus - Practice 2 / Grade 8
Separate Spoken Words from a Possible Subtext - Practice 1 / Grade 9
Separate Spoken Words from a Possible Subtext - Practice 2 / Grade 9
Develop a Motif as Its Meaning Changes / Grade 11
Fit Narrative Voice to a Stated Register - Practice 1 / Grade 11
Fit Narrative Voice to a Stated Register - Practice 2 / Grade 11
Dialogue, Subtext, and Competing Intentions / Undergraduate
Find the Setting in a Short Scene - Practice 1 / Kindergarten
Find the Setting in a Short Scene - Practice 2 / Kindergarten
Try Words That Suggest Sounds - Practice 1 / Grade 1
Try Words That Suggest Sounds - Practice 2 / Grade 1
Hear Rhyme and Notice Poem Lines / Grade 2
Listen for Matching Ending Sounds - Practice 1 / Grade 2
Listen for Matching Ending Sounds - Practice 2 / Grade 2
Explain the Shared Feature in a Simile - Practice 1 / Grade 4
Explain the Shared Feature in a Simile - Practice 2 / Grade 4
Use Sound and Personification in Poetry / Grade 5
Plan Lines in Stanza Groups - Practice 1 / Grade 5
Plan Lines in Stanza Groups - Practice 2 / Grade 5
Read a Metaphor without Making It Literal - Practice 1 / Grade 7
Read a Metaphor without Making It Literal - Practice 2 / Grade 7
Notice What a Line Break Leaves at the Edge - Practice 1 / Grade 8
Notice What a Line Break Leaves at the Edge - Practice 2 / Grade 8
Use Line Breaks to Shape Expectation / Grade 9
Keep an Extended Metaphor Coherent - Practice 1 / Grade 10
Keep an Extended Metaphor Coherent - Practice 2 / Grade 10
Use a Chosen Poetic Constraint Deliberately - Practice 1 / Grade 12
Use a Chosen Poetic Constraint Deliberately - Practice 2 / Grade 12
Edit Poetic Variants with an Explicit Rationale / Graduate
Give a Character a Clear Want - Practice 1 / Grade 1
Give a Character a Clear Want - Practice 2 / Grade 1
Build a Clear Story Plan / Grade 2
Put an Obstacle between a Character and a Goal - Practice 1 / Grade 2
Put an Obstacle between a Character and a Goal - Practice 2 / Grade 2
Give a Character a Goal and a Choice / Grade 3
Choose a Narrator Position - Practice 1 / Grade 4
Choose a Narrator Position - Practice 2 / Grade 4
Plant a Clue and Pay It Off / Grade 5
Plan a Scene from One Viewpoint / Grade 5
Connect a Character Choice to Its Consequence - Practice 1 / Grade 5
Connect a Character Choice to Its Consequence - Practice 2 / Grade 5
Support a Character Choice with a Motive - Practice 1 / Grade 7
Support a Character Choice with a Motive - Practice 2 / Grade 7
Connect Motivation, Conflict, and Choice / Grade 8
Prepare a Later Event with an Earlier Detail - Practice 1 / Grade 8
Prepare a Later Event with an Earlier Detail - Practice 2 / Grade 8
Test a Narrator Claim against Story Evidence - Practice 1 / Grade 9
Test a Narrator Claim against Story Evidence - Practice 2 / Grade 9
Use Parallel Scenes to Make Change Visible - Practice 1 / Grade 11
Use Parallel Scenes to Make Change Visible - Practice 2 / Grade 11
Compare Interpretations without Erasing Ambiguity - Practice 1 / Grade 12
Compare Interpretations without Erasing Ambiguity - Practice 2 / Grade 12
Focalization and the Limits of Narrative Knowledge / Undergraduate
Design a Constraint-Led Narrative Inquiry / Graduate
Choose a Character, Place, and Goal / Kindergarten
Find Who Is Acting in a Story - Practice 1 / Kindergarten
Find Who Is Acting in a Story - Practice 2 / Kindergarten
Build a Beginning, Middle, and Ending / Grade 1
Connect Actions with Because and So / Grade 2
Connect a Goal, Problem, and Ending / Grade 3
Connect Story Events through Cause - Practice 1 / Grade 3
Connect Story Events through Cause - Practice 2 / Grade 3
Preserve a Stated Story Dependency - Practice 1 / Grade 4
Preserve a Stated Story Dependency - Practice 2 / Grade 4
Choose Scene or Summary for a Pacing Goal - Practice 1 / Grade 6
Choose Scene or Summary for a Pacing Goal - Practice 2 / Grade 6
Control Narrative Pace with Scene and Summary / Grade 10
Distinguish Event Order from Telling Order - Practice 1 / Grade 10
Distinguish Event Order from Telling Order - Practice 2 / Grade 10
Order Three Story Pictures - Practice 1 / Kindergarten
Order Three Story Pictures - Practice 2 / Kindergarten
Revise for One Observable Goal - Practice 1 / Grade 3
Revise for One Observable Goal - Practice 2 / Grade 3
Turn Revision Goals into Specific Changes / Grade 6
Revise for Clarity Without Changing the Facts / Grade 6
Turn a Broad Writing Aim into a Concrete Step - Practice 1 / Grade 6
Turn a Broad Writing Aim into a Concrete Step - Practice 2 / Grade 6
Keep a Limited Viewpoint within Its Knowledge - Practice 1 / Grade 7
Keep a Limited Viewpoint within Its Knowledge - Practice 2 / Grade 7
Revise Paragraphs for Coherence / Grade 9
Connect an Ending to What Came Before - Practice 1 / Grade 9
Connect an Ending to What Came Before - Practice 2 / Grade 9
Choose the Right Level of Revision - Practice 1 / Grade 10
Choose the Right Level of Revision - Practice 2 / Grade 10
Give Feedback a Writer Can Act On - Practice 1 / Grade 11
Give Feedback a Writer Can Act On - Practice 2 / Grade 11
Plan a Revision That Preserves Deliberate Ambiguity / Grade 12
Support a Creative Reflection with Draft Evidence - Practice 1 / Grade 12
Support a Creative Reflection with Draft Evidence - Practice 2 / Grade 12
Documentary Writing and Transparent Reconstruction / Graduate
Separate Weather from Climate Descriptions - Practice 1 / Grade 2
Separate Weather from Climate Descriptions - Practice 2 / Grade 2
Weather or Climate? / Grade 3
Forecast detectives / Grade 3
Follow an echo / Grade 3
Read Weather Tables Without Overclaiming / Grade 4
Total a Rainfall Record - Practice 1 / Grade 4
Total a Rainfall Record - Practice 2 / Grade 4
Compare Long-Term Climate Averages / Grade 5
Rain chances are not timers / Grade 5
Radar is a measurement / Grade 5
Compare a Value with a Climate Reference - Practice 1 / Grade 6
Compare a Value with a Climate Reference - Practice 2 / Grade 6
Compare Seasonal Climate Patterns / Grade 8
Evaluate a forecast / Grade 8
Radar limits and evidence / Grade 8
Separate Climate Emulator Sensitivity from Attribution / Graduate
Follow the Compass / Grade 1
Find Opposite Compass Directions - Practice 1 / Grade 1
Find Opposite Compass Directions - Practice 2 / Grade 1
Plan a Route with Compass Directions / Grade 2
Meet the compass / Grade 3
Turn around a Compass Rose - Practice 1 / Grade 3
Turn around a Compass Rose - Practice 2 / Grade 3
Use a Stated Clock Offset - Practice 1 / Grade 4
Use a Stated Clock Offset - Practice 2 / Grade 4
Follow a bearing / Grade 5
Magnetic and true north / Grade 8
Relate Longitude to Ideal Solar Time - Practice 1 / Grade 10
Relate Longitude to Ideal Solar Time - Practice 2 / Grade 10
Describe Places Near and Between / Kindergarten
Find a Place beside Another Place - Practice 1 / Kindergarten
Find a Place beside Another Place - Practice 2 / Kindergarten
In, On, or Under? - Practice 1 / Pre-K
In, On, or Under? - Practice 2 / Pre-K
Read a Map Grid Address - Practice 1 / Grade 2
Read a Map Grid Address - Practice 2 / Grade 2
Add the Parts of a Route - Practice 1 / Grade 2
Add the Parts of a Route - Practice 2 / Grade 2
Find Places on a Neighborhood Grid / Grade 3
Convert Map Length to Ground Distance - Practice 1 / Grade 3
Convert Map Length to Ground Distance - Practice 2 / Grade 3
Locate North and South of the Equator - Practice 1 / Grade 3
Locate North and South of the Equator - Practice 2 / Grade 3
Use Grid References and Scale / Grade 4
Plan a Route Using Map Distances / Grade 4
Locate East and West of Greenwich - Practice 1 / Grade 4
Locate East and West of Greenwich - Practice 2 / Grade 4
Convert Map Scale into Real Distance / Grade 5
Calculate Average Population Density - Practice 1 / Grade 5
Calculate Average Population Density - Practice 2 / Grade 5
Read Latitude and Longitude / Grade 6
Compare Two Maps of the Same Route / Grade 6
Read a Ratio Scale - Practice 1 / Grade 6
Read a Ratio Scale - Practice 2 / Grade 6
Convert a Representative Map Scale / Grade 7
Compare Counts with Rates on a Map - Practice 1 / Grade 7
Compare Counts with Rates on a Map - Practice 2 / Grade 7
Express a Regional Rate per Thousand - Practice 1 / Grade 7
Express a Regional Rate per Thousand - Practice 2 / Grade 7
Find the Smaller Longitude Separation - Practice 1 / Grade 8
Find the Smaller Longitude Separation - Practice 2 / Grade 8
Combine Regions before Finding Density - Practice 1 / Grade 8
Combine Regions before Finding Density - Practice 2 / Grade 8
Choose a Map Projection by Purpose - Practice 1 / Grade 9
Choose a Map Projection by Purpose - Practice 2 / Grade 9
Bound a Difference between Map Coordinates - Practice 1 / Grade 9
Bound a Difference between Map Coordinates - Practice 2 / Grade 9
Separate Net Migration from Total Movement - Practice 1 / Grade 9
Separate Net Migration from Total Movement - Practice 2 / Grade 9
Read a Thematic Map Class Boundary - Practice 1 / Grade 10
Read a Thematic Map Class Boundary - Practice 2 / Grade 10
Square a Linear Scale for Area - Practice 1 / Grade 10
Square a Linear Scale for Area - Practice 2 / Grade 10
Interpret Population Density Across Areas / Grade 11
Weight a Survey by the Represented Population - Practice 1 / Grade 11
Weight a Survey by the Represented Population - Practice 2 / Grade 11
Use the Eligible Population Denominator - Practice 1 / Grade 11
Use the Eligible Population Denominator - Practice 2 / Grade 11
Choose the Baseline for Percent Change - Practice 1 / Grade 11
Choose the Baseline for Percent Change - Practice 2 / Grade 11
Evaluate a Spatial Site-Selection Model / Grade 12
Avoid Guessing Individual Traits from Regional Data - Practice 1 / Grade 12
Avoid Guessing Individual Traits from Regional Data - Practice 2 / Grade 12
See How Grouping Changes Regional Summaries - Practice 1 / Grade 12
See How Grouping Changes Regional Summaries - Practice 2 / Grade 12
Keep Missing Measurements Separate from Zero - Practice 1 / Grade 12
Keep Missing Measurements Separate from Zero - Practice 2 / Grade 12
Aggregation, Denominators, and Ecological Inference / Undergraduate
Validate Spatial Predictions for Their Intended Use / Graduate
Ordinary Kriging as Constrained Prediction / Graduate
Name Landforms from Their Shapes - Practice 1 / Grade 1
Name Landforms from Their Shapes - Practice 2 / Grade 1
Describe Land and Water / Grade 2
Distinguish Islands, Peninsulas, and Valleys / Grade 3
Compare Heights above the Same Datum - Practice 1 / Grade 5
Compare Heights above the Same Datum - Practice 2 / Grade 5
Trace a River Network Downstream - Practice 1 / Grade 5
Trace a River Network Downstream - Practice 2 / Grade 5
Calculate a Land-Cover Percentage - Practice 1 / Grade 8
Calculate a Land-Cover Percentage - Practice 2 / Grade 8
Trace Drainage Through a Watershed / Grade 9
Sort Land and Water Clues - Practice 1 / Kindergarten
Sort Land and Water Clues - Practice 2 / Kindergarten
Match Places to Their Map Symbols - Practice 1 / Grade 1
Match Places to Their Map Symbols - Practice 2 / Grade 1
Read a Map Key / Grade 2
Choose and Read Map Symbols / Grade 3
Choose a Map Projection for a Purpose / Grade 10
Raster Aggregation and the Meaning of a Cell / Undergraduate
Use a Simple Map Key - Practice 1 / Kindergarten
Use a Simple Map Key - Practice 2 / Kindergarten
Follow a Picture Route - Practice 1 / Pre-K
Follow a Picture Route - Practice 2 / Pre-K
Count countries with a rule / Grade 3
Countries and territories / Grade 5
Ask What a Country Count Includes - Practice 1 / Grade 6
Ask What a Country Count Includes - Practice 2 / Grade 6
Audit a country-count claim / Grade 8
Languages cross borders / Grade 3
Count carefully / Grade 5
Count Overlapping Language Groups - Practice 1 / Grade 7
Count Overlapping Language Groups - Practice 2 / Grade 7
Evaluate a language survey / Grade 8
Learn How Cuneiform Leaves Marks - Practice 1 / Grade 3
Learn How Cuneiform Leaves Marks - Practice 2 / Grade 3
Connect the Nile with Ancient Farming - Practice 1 / Grade 4
Connect the Nile with Ancient Farming - Practice 2 / Grade 4
Mesopotamia: Writing and Record Keeping / Grade 5
Ancient Egypt: Materials from the Nile / Grade 6
Find Different Kinds of Records - Practice 1 / Grade 1
Find Different Kinds of Records - Practice 2 / Grade 1
Learn from Historical Objects / Grade 3
Compare Primary and Secondary Sources / Grade 4
Compare Two Accounts of One Event / Grade 4
Ask Which Record Can Answer the Question / Grade 6
Ask Who Made a Historical Source - Practice 1 / Grade 6
Ask Who Made a Historical Source - Practice 2 / Grade 6
Check Whether Sources Are Independent - Practice 1 / Grade 7
Check Whether Sources Are Independent - Practice 2 / Grade 7
Separate Earlier Events from Proven Causes - Practice 1 / Grade 8
Separate Earlier Events from Proven Causes - Practice 2 / Grade 8
Read an Old Map with Its Own Date - Practice 1 / Grade 8
Read an Old Map with Its Own Date - Practice 2 / Grade 8
Notice What an Archive Does Not Cover - Practice 1 / Grade 9
Notice What an Archive Does Not Cover - Practice 2 / Grade 9
Reconcile Records with Different Units - Practice 1 / Grade 9
Reconcile Records with Different Units - Practice 2 / Grade 9
Use a Historical Quotation Carefully - Practice 1 / Grade 10
Use a Historical Quotation Carefully - Practice 2 / Grade 10
Distinguish a Surviving Sample from a Population - Practice 1 / Grade 11
Distinguish a Surviving Sample from a Population - Practice 2 / Grade 11
Compare Changes without Overclaiming Causation - Practice 1 / Grade 11
Compare Changes without Overclaiming Causation - Practice 2 / Grade 11
Reconcile Historical Accounts and Missing Evidence / Grade 12
Test Competing Historical Explanations - Practice 1 / Grade 12
Test Competing Historical Explanations - Practice 2 / Grade 12
Trace Provenance Before Counting Corroboration / Undergraduate
Archival Survival and Partial Identification / Graduate
Historical Corpus Search and OCR Measurement Error / Graduate
Look for Clues in Old Objects - Practice 1 / Kindergarten
Look for Clues in Old Objects - Practice 2 / Kindergarten
Look at a Picture from Before - Practice 1 / Pre-K
Look at a Picture from Before - Practice 2 / Pre-K
Compare Then and Now / Grade 1
Read Events from a Labeled Timeline - Practice 1 / Grade 1
Read Events from a Labeled Timeline - Practice 2 / Grade 1
Put Events on a Timeline / Grade 2
Measure Time between Two Year Marks - Practice 1 / Grade 2
Measure Time between Two Year Marks - Practice 2 / Grade 2
Read a Community Timeline / Grade 3
Order Records by Their Dates - Practice 1 / Grade 3
Order Records by Their Dates - Practice 2 / Grade 3
Count across BCE and CE without Year Zero - Practice 1 / Grade 4
Count across BCE and CE without Year Zero - Practice 2 / Grade 4
Measure Change Across a Longer Timeline / Grade 5
Assign a Positive CE Year to Its Century - Practice 1 / Grade 5
Assign a Positive CE Year to Its Century - Practice 2 / Grade 5
Read BCE and CE Dates Carefully / Grade 8
Bound an Interval between Uncertain Dates - Practice 1 / Grade 12
Bound an Interval between Uncertain Dates - Practice 2 / Grade 12
Build Historical Date Bounds from Evidence / Undergraduate
Past, Present, and Future / Kindergarten
Put a Short Event Sequence in Order - Practice 1 / Kindergarten
Put a Short Event Sequence in Order - Practice 2 / Kindergarten
First and Then in a Tiny Story - Practice 1 / Pre-K
First and Then in a Tiny Story - Practice 2 / Pre-K
Distinguish the Declaration and the Constitution / Grade 9
Reconstruction: Constitutional Change and Enforcement / Grade 11
Match Transport to Its Stated Power - Practice 1 / Grade 2
Match Transport to Its Stated Power - Practice 2 / Grade 2
Compare Hand Copying and Reusable Type - Practice 1 / Grade 5
Compare Hand Copying and Reusable Type - Practice 2 / Grade 5
Compare Production Records with Clear Units - Practice 1 / Grade 6
Compare Production Records with Clear Units - Practice 2 / Grade 6
The Silk Roads as Networks of Exchange / Grade 7
Balance a Historical Trade Ledger Model - Practice 1 / Grade 7
Balance a Historical Trade Ledger Model - Practice 2 / Grade 7
Industrialization: Production and Working Lives / Grade 10
Separate Nominal Prices from Constant-Price Values - Practice 1 / Grade 10
Separate Nominal Prices from Constant-Price Values - Practice 2 / Grade 10
Compare Historical Mechanisms and Counterfactuals / Graduate
Make Ten to Add / Grade 1
Count On to Add / Grade 1
Find the Missing Part of Ten - Practice 1 / Grade 1
Find the Missing Part of Ten - Practice 2 / Grade 1
Add Tens and Ones / Grade 2
Add Across a Ten - Practice 1 / Grade 2
Add Across a Ten - Practice 2 / Grade 2
Add Across Hundreds / Grade 3
Join Two Small Groups - Practice 1 / Kindergarten
Join Two Small Groups - Practice 2 / Kindergarten
Plan a Pretend Craft Budget / Grade 3
Balance a Tiny Workshop's Books / Grade 6
Use Derivatives to Find Instantaneous Rates / Grade 12
Differentiate a Power and Evaluate - Practice 1 / Grade 12
Differentiate a Power and Evaluate - Practice 2 / Grade 12
Build a Tangent Line at a Point - Practice 1 / Grade 12
Build a Tangent Line at a Point - Practice 2 / Grade 12
Accumulate a Constant Rate - Practice 1 / Grade 12
Accumulate a Constant Rate - Practice 2 / Grade 12
Separate Average and Instantaneous Rate - Practice 1 / Grade 12
Separate Average and Instantaneous Rate - Practice 2 / Grade 12
Find a Stationary Point - Practice 1 / Grade 12
Find a Stationary Point - Practice 2 / Grade 12
Taylor Approximation with a Remainder Bound / Undergraduate
KKT Conditions and Constraint Sensitivity / Graduate
Share Equally / Grade 3
Make Sense of Division Leftovers / Grade 3
Share into Equal Groups - Practice 1 / Grade 3
Share into Equal Groups - Practice 2 / Grade 3
Divide with Friendly Chunks / Grade 4
Interpret a Remainder - Practice 1 / Grade 4
Interpret a Remainder - Practice 2 / Grade 4
Measure with Equal Tiles - Practice 1 / Grade 1
Measure with Equal Tiles - Practice 2 / Grade 1
Count Minutes Forward - Practice 1 / Grade 2
Count Minutes Forward - Practice 2 / Grade 2
Measure Elapsed Time / Grade 3
Find a Missing Straight Angle - Practice 1 / Grade 4
Find a Missing Straight Angle - Practice 2 / Grade 4
Convert Meters to Centimeters - Practice 1 / Grade 5
Convert Meters to Centimeters - Practice 2 / Grade 5
Name Equal Parts / Grade 3
Count Equal Fraction Parts - Practice 1 / Grade 3
Count Equal Fraction Parts - Practice 2 / Grade 3
Build Equivalent Fractions / Grade 4
Find Fractions of a Collection / Grade 4
Scale Both Parts of a Fraction - Practice 1 / Grade 4
Scale Both Parts of a Fraction - Practice 2 / Grade 4
Add Fractions with Unlike Denominators / Grade 5
Find a Fraction of a Set - Practice 1 / Grade 5
Find a Fraction of a Set - Practice 2 / Grade 5
Walk Around a Rectangle - Practice 1 / Grade 2
Walk Around a Rectangle - Practice 2 / Grade 2
Cover a Rectangle with Unit Squares - Practice 1 / Grade 3
Cover a Rectangle with Unit Squares - Practice 2 / Grade 3
Separate Area from Perimeter / Grade 4
Build Volume One Layer at a Time / Grade 5
Build Volume from Layers - Practice 1 / Grade 5
Build Volume from Layers - Practice 2 / Grade 5
Use a Perpendicular Triangle Height - Practice 1 / Grade 6
Use a Perpendicular Triangle Height - Practice 2 / Grade 6
Find a Right-Triangle Hypotenuse - Practice 1 / Grade 8
Find a Right-Triangle Hypotenuse - Practice 2 / Grade 8
Use Right-Triangle Relationships / Grade 10
Use Differences to Find Distance - Practice 1 / Grade 10
Use Differences to Find Distance - Practice 2 / Grade 10
Average Corresponding Coordinates - Practice 1 / Grade 10
Average Corresponding Coordinates - Practice 2 / Grade 10
Divide a Polygon into Triangles - Practice 1 / Grade 10
Divide a Polygon into Triangles - Practice 2 / Grade 10
Square the Length Scale for Area - Practice 1 / Grade 10
Square the Length Scale for Area - Practice 2 / Grade 10
Read a Checkerboard / Grade 2
Choose a Legal Checkers Step / Grade 2
Checkers Jumps Come First / Grade 3
Follow a Complete Checkers Jump Trail / Grade 3
Checkers Kings: Crown and Stop / Grade 4
Checkers: Think One Turn Ahead / Grade 4
Evaluate Expressions Step by Step / Grade 6
Measure Distance Across Zero - Practice 1 / Grade 6
Measure Distance Across Zero - Practice 2 / Grade 6
Substitute Before Calculating - Practice 1 / Grade 6
Substitute Before Calculating - Practice 2 / Grade 6
Solve Equations by Undoing Operations / Grade 7
Undo a Two-Step Equation - Practice 1 / Grade 7
Undo a Two-Step Equation - Practice 2 / Grade 7
Multiply Signed Numbers - Practice 1 / Grade 7
Multiply Signed Numbers - Practice 2 / Grade 7
Find Slope and Starting Value / Grade 8
Calculate Rise per Run - Practice 1 / Grade 8
Calculate Rise per Run - Practice 2 / Grade 8
Read a Linear Rule - Practice 1 / Grade 8
Read a Linear Rule - Practice 2 / Grade 8
Combine Powers with the Same Base - Practice 1 / Grade 8
Combine Powers with the Same Base - Practice 2 / Grade 8
Use Sum and Difference Together - Practice 1 / Grade 8
Use Sum and Difference Together - Practice 2 / Grade 8
Solve Quadratics by Factoring / Grade 9
Evaluate a Quadratic Carefully - Practice 1 / Grade 9
Evaluate a Quadratic Carefully - Practice 2 / Grade 9
Use the Zero-Product Rule - Practice 1 / Grade 9
Use the Zero-Product Rule - Practice 2 / Grade 9
Find a Term by Its Position - Practice 1 / Grade 9
Find a Term by Its Position - Practice 2 / Grade 9
Model Exponential Growth and Decay / Grade 11
Apply the Inner Function First - Practice 1 / Grade 11
Apply the Inner Function First - Practice 2 / Grade 11
Reverse a Linear Function - Practice 1 / Grade 11
Reverse a Linear Function - Practice 2 / Grade 11
Count Repeated Multiplications - Practice 1 / Grade 11
Count Repeated Multiplications - Practice 2 / Grade 11
Read a Logarithm as an Exponent - Practice 1 / Grade 11
Read a Logarithm as an Exponent - Practice 2 / Grade 11
Least Squares as an Orthogonal Projection / Undergraduate
Identifiability and Ridge Regularization / Graduate
Count Equal Pairs - Practice 1 / Grade 1
Count Equal Pairs - Practice 2 / Grade 1
Equal Groups to Multiplication / Grade 3
Read Rows and Columns - Practice 1 / Grade 3
Read Rows and Columns - Practice 2 / Grade 3
Multiply by Breaking Apart / Grade 4
Break Apart a Multiplication - Practice 1 / Grade 4
Break Apart a Multiplication - Practice 2 / Grade 4
Count in Twos, Fives, and Tens / Grade 1
Count and Find the Next Number / Kindergarten
Count, Compare, and Find One More / Kindergarten
Count Each Dot Once - Practice 1 / Kindergarten
Count Each Dot Once - Practice 2 / Kindergarten
Take One More Step - Practice 1 / Kindergarten
Take One More Step - Practice 2 / Kindergarten
Find the Larger Group - Practice 1 / Kindergarten
Find the Larger Group - Practice 2 / Kindergarten
Point and Count to Five - Practice 1 / Pre-K
Point and Count to Five - Practice 2 / Pre-K
Find the Number That Breaks the Rule / Grade 3
Sort Numbers with Two Rules / Grade 4
An Unusual Value Is a Clue / Grade 5
Compare AND with OR / Grade 6
Finish a Shape Pattern - Practice 1 / Pre-K
Finish a Shape Pattern - Practice 2 / Pre-K
Build Tens and Ones / Grade 1
Build a Number from Tens and Ones - Practice 1 / Grade 1
Build a Number from Tens and Ones - Practice 2 / Grade 1
Build Three-Digit Numbers / Grade 2
Read Hundreds, Tens and Ones - Practice 1 / Grade 2
Read Hundreds, Tens and Ones - Practice 2 / Grade 2
Round by Finding the Midpoint / Grade 3
Round to the Nearest Hundred - Practice 1 / Grade 4
Round to the Nearest Hundred - Practice 2 / Grade 4
Connect Decimals and Hundredths - Practice 1 / Grade 5
Connect Decimals and Hundredths - Practice 2 / Grade 5
Build Equivalent Ratios and Unit Rates / Grade 6
Compare Using a Unit Rate - Practice 1 / Grade 6
Compare Using a Unit Rate - Practice 2 / Grade 6
Find Ten Percent - Practice 1 / Grade 6
Find Ten Percent - Practice 2 / Grade 6
Find the New Amount after an Increase - Practice 1 / Grade 7
Find the New Amount after an Increase - Practice 2 / Grade 7
Use a Fixed Map Scale - Practice 1 / Grade 7
Use a Fixed Map Scale - Practice 2 / Grade 7
Scale Corresponding Lengths - Practice 1 / Grade 9
Scale Corresponding Lengths - Practice 2 / Grade 9
Use Opposite over Hypotenuse - Practice 1 / Grade 10
Use Opposite over Hypotenuse - Practice 2 / Grade 10
Subtract by Counting Up / Grade 1
Take Away with Dots / Grade 1
Subtract from Teen Numbers - Practice 1 / Grade 1
Subtract from Teen Numbers - Practice 2 / Grade 1
Subtract with a Regrouped Ten / Grade 2
Exchange a Ten to Subtract - Practice 1 / Grade 2
Exchange a Ten to Subtract - Practice 2 / Grade 2
Subtract Across a Zero / Grade 3
Take Away and Count What Remains - Practice 1 / Kindergarten
Take Away and Count What Remains - Practice 2 / Kindergarten
Combine Counts in a Table - Practice 1 / Grade 3
Combine Counts in a Table - Practice 2 / Grade 3
Find Mean, Median, and Range / Grade 5
Find the Mean of Four Counts - Practice 1 / Grade 5
Find the Mean of Four Counts - Practice 2 / Grade 5
Choose Samples That Match a Question / Grade 7
Scale a Stated Sample Proportion - Practice 1 / Grade 7
Scale a Stated Sample Proportion - Practice 2 / Grade 7
Use Conditional Probabilities / Grade 9
Sort Before Finding a Median - Practice 1 / Grade 9
Sort Before Finding a Median - Practice 2 / Grade 9
Compare Overall and Grouped Rates / Grade 11
Keep the Weights in an Average - Practice 1 / Grade 11
Keep the Weights in an Average - Practice 2 / Grade 11
Bayesian Updating and Model-Conditional Uncertainty / Graduate
Find the Same Letter - Practice 1 / Pre-K
Find the Same Letter - Practice 2 / Pre-K
Compare Two Solutions / Grade 4
Compare Two Options Using Stated Features - Practice 1 / Grade 4
Compare Two Options Using Stated Features - Practice 2 / Grade 4
Compare Two Plans Using Evidence / Grade 5
Compare Perspectives on a Shared Event / Grade 8
Synthesize Sources Without Erasing Limits / Grade 11
Combine Sources without Erasing Their Differences - Practice 1 / Grade 11
Combine Sources without Erasing Their Differences - Practice 2 / Grade 11
Read a Research Claim Against Its Design / Undergraduate
Synthesize Estimates Without Hiding Heterogeneity / Graduate
Compare Effects Rather Than Significance Labels / Graduate
Find Details in the Kite Story / Grade 1
Read Instructions and Their Conditions / Grade 5
Operational Definitions and the Claims They Permit / Undergraduate
Listen for Story Details / Kindergarten
Listen for Small Story Details - Practice 1 / Kindergarten
Listen for Small Story Details - Practice 2 / Kindergarten
Listen and Find the Picture - Practice 1 / Pre-K
Listen and Find the Picture - Practice 2 / Pre-K
Check a Headline Against the Details / Grade 4
Check What a Survey Really Says / Grade 6
Evaluate Sponsored Claims / Grade 7
Report a Count without Changing Its Scope - Practice 1 / Grade 7
Report a Count without Changing Its Scope - Practice 2 / Grade 7
Separate a Proposal from Its Supporting Evidence - Practice 1 / Grade 7
Separate a Proposal from Its Supporting Evidence - Practice 2 / Grade 7
Keep an Idea Connected to Its Source - Practice 1 / Grade 8
Keep an Idea Connected to Its Source - Practice 2 / Grade 8
Match a Claim to the Evidence Provided - Practice 1 / Grade 8
Match a Claim to the Evidence Provided - Practice 2 / Grade 8
Read a Comparison without Inventing a Cause - Practice 1 / Grade 8
Read a Comparison without Inventing a Cause - Practice 2 / Grade 8
Limit a Conclusion to the Observed Sample - Practice 1 / Grade 9
Limit a Conclusion to the Observed Sample - Practice 2 / Grade 9
Identify How a Writer Supports a Position - Practice 1 / Grade 9
Identify How a Writer Supports a Position - Practice 2 / Grade 9
Turn a Vague Outcome into a Defined Measure - Practice 1 / Grade 10
Turn a Vague Outcome into a Defined Measure - Practice 2 / Grade 10
Check Whether the Method Supports the Conclusion - Practice 1 / Grade 10
Check Whether the Method Supports the Conclusion - Practice 2 / Grade 10
Read Percentage Claims with Their Baselines / Grade 11
Preserve Some without Turning It into All - Practice 1 / Grade 11
Preserve Some without Turning It into All - Practice 2 / Grade 11
Retain the Denominator in a Percentage Report - Practice 1 / Grade 11
Retain the Denominator in a Percentage Report - Practice 2 / Grade 11
Keep a One-Way Rule Pointing the Right Way - Practice 1 / Grade 11
Keep a One-Way Rule Pointing the Right Way - Practice 2 / Grade 11
Paraphrase without Increasing Certainty - Practice 1 / Grade 12
Paraphrase without Increasing Certainty - Practice 2 / Grade 12
Separate an Association from a Causal Claim - Practice 1 / Grade 12
Separate an Association from a Causal Claim - Practice 2 / Grade 12
State What a Measure Does Not Establish - Practice 1 / Grade 12
State What a Measure Does Not Establish - Practice 2 / Grade 12
Audit a Summary for Scope, Uncertainty and Missing Data - Practice 1 / Grade 12
Audit a Summary for Scope, Uncertainty and Missing Data - Practice 2 / Grade 12
Audit Missing Evidence in a Research Synthesis / Graduate
Find a Word That Names a Thing - Practice 1 / Grade 1
Find a Word That Names a Thing - Practice 2 / Grade 1
Find the Action Word - Practice 1 / Grade 1
Find the Action Word - Practice 2 / Grade 1
Make a Regular Plural - Practice 1 / Grade 2
Make a Regular Plural - Practice 2 / Grade 2
Learn Plurals That Change Form - Practice 1 / Grade 2
Learn Plurals That Change Form - Practice 2 / Grade 2
Match One or More with Is and Are - Practice 1 / Grade 2
Match One or More with Is and Are - Practice 2 / Grade 2
Tell What Happened Yesterday - Practice 1 / Grade 2
Tell What Happened Yesterday - Practice 2 / Grade 2
Connect Ideas by Their Relationship - Practice 1 / Grade 4
Connect Ideas by Their Relationship - Practice 2 / Grade 4
Find the Subject beyond an Intervening Phrase - Practice 1 / Grade 5
Find the Subject beyond an Intervening Phrase - Practice 2 / Grade 5
Replace a Pronoun When Two People Fit - Practice 1 / Grade 5
Replace a Pronoun When Two People Fit - Practice 2 / Grade 5
Give a Dependent Clause a Main Clause - Practice 1 / Grade 6
Give a Dependent Clause a Main Clause - Practice 2 / Grade 6
Name Who Performs the Opening Action - Practice 1 / Grade 6
Name Who Performs the Opening Action - Practice 2 / Grade 6
Keep Listed Actions Parallel - Practice 1 / Grade 7
Keep Listed Actions Parallel - Practice 2 / Grade 7
Choose a Subject Pronoun in a Pair - Practice 1 / Grade 7
Choose a Subject Pronoun in a Pair - Practice 2 / Grade 7
Name the Agent in an Active Revision - Practice 1 / Grade 8
Name the Agent in an Active Revision - Practice 2 / Grade 8
Signal the Intended Logical Relationship - Practice 1 / Grade 9
Signal the Intended Logical Relationship - Practice 2 / Grade 9
Use Were in an Unreal Formal Condition - Practice 1 / Grade 10
Use Were in an Unreal Formal Condition - Practice 2 / Grade 10
Preserve Parallel Infinitive Phrases - Practice 1 / Grade 10
Preserve Parallel Infinitive Phrases - Practice 2 / Grade 10
Use an Action as a Clue - Practice 1 / Grade 2
Use an Action as a Clue - Practice 2 / Grade 2
Use Clues to Infer / Grade 3
Infer a Character's Changing Feelings / Grade 4
Infer Without Jumping to Conclusions / Grade 4
Support an Inference without Pretending to Know - Practice 1 / Grade 5
Support an Inference without Pretending to Know - Practice 2 / Grade 5
Distinguish Evidence from Assumption / Grade 6
Distinguish a Narrator's View from Everyone's View - Practice 1 / Grade 6
Distinguish a Narrator's View from Everyone's View - Practice 2 / Grade 6
Separate a Narrator's Belief from Evidence / Grade 7
Read Irony Through Context / Grade 10
Capital Letters: Sentence Starts and I / Grade 1
Begin a Sentence with a Capital - Practice 1 / Grade 1
Begin a Sentence with a Capital - Practice 2 / Grade 1
Capital Letters in Names, Days, and Months / Grade 2
Capitalization in Book and Story Titles / Grade 4
Capitalization: Names, Roles, and General Words / Grade 6
Match Lowercase and Uppercase Letters - Practice 1 / Kindergarten
Match Lowercase and Uppercase Letters - Practice 2 / Kindergarten
Find the Main Idea / Grade 3
Separate the Main Idea from a Detail - Practice 1 / Grade 3
Separate the Main Idea from a Detail - Practice 2 / Grade 3
Connect Details to a Main Idea / Grade 4
Summarize a Repair Project / Grade 5
Trace Claims, Reasons, and Counterarguments / Grade 9
Punctuation: Periods, Questions, and Exclamations / Grade 1
Choose a Statement or Question Ending - Practice 1 / Grade 1
Choose a Statement or Question Ending - Practice 2 / Grade 1
Commas in Lists and Direct Address / Grade 2
Apostrophes: Shortened Words and Ownership / Grade 3
Show Missing Letters in a Contraction - Practice 1 / Grade 3
Show Missing Letters in a Contraction - Practice 2 / Grade 3
Show One Person Owns Something - Practice 1 / Grade 3
Show One Person Owns Something - Practice 2 / Grade 3
Punctuation in Spoken Dialogue / Grade 4
Show Ownership by a Regular Plural - Practice 1 / Grade 4
Show Ownership by a Regular Plural - Practice 2 / Grade 4
Place Punctuation in Direct Speech - Practice 1 / Grade 4
Place Punctuation in Direct Speech - Practice 2 / Grade 4
Commas Between Clauses and Around Extra Details / Grade 5
Separate Three Items Consistently - Practice 1 / Grade 5
Separate Three Items Consistently - Practice 2 / Grade 5
Semicolons and Colons: Connect and Introduce / Grade 6
Join Complete Clauses without a Comma Splice - Practice 1 / Grade 6
Join Complete Clauses without a Comma Splice - Practice 2 / Grade 6
Close an Inserted Parenthesis - Practice 1 / Grade 7
Close an Inserted Parenthesis - Practice 2 / Grade 7
Introduce a List after a Complete Clause - Practice 1 / Grade 8
Introduce a List after a Complete Clause - Practice 2 / Grade 8
Keep an Identifying Clause Attached - Practice 1 / Grade 9
Keep an Identifying Clause Attached - Practice 2 / Grade 9
Punctuate However between Complete Clauses - Practice 1 / Grade 10
Punctuate However between Complete Clauses - Practice 2 / Grade 10
Introduce a Quoted Sentence after a Speech Tag - Practice 1 / Grade 11
Introduce a Quoted Sentence after a Speech Tag - Practice 2 / Grade 11
Follow the Seed Steps / Grade 1
Follow a Short Sequence - Practice 1 / Grade 1
Follow a Short Sequence - Practice 2 / Grade 1
Put Events in Order / Grade 2
Put the Puppet Show in Order / Grade 3
Solve Words from Context / Grade 3
Read the Prefix Un - Practice 1 / Grade 3
Read the Prefix Un - Practice 2 / Grade 3
Use a Sentence to Find a Similar Meaning - Practice 1 / Grade 3
Use a Sentence to Find a Similar Meaning - Practice 2 / Grade 3
Use Contrast and Examples as Word Clues / Grade 4
Choose the Word That Fits Its Meaning - Practice 1 / Grade 4
Choose the Word That Fits Its Meaning - Practice 2 / Grade 4
Read Common Prefix Meanings - Practice 1 / Grade 5
Read Common Prefix Meanings - Practice 2 / Grade 5
Match a Word to a Formal Notice - Practice 1 / Grade 6
Match a Word to a Formal Notice - Practice 2 / Grade 6
Replace a Vague Reference with the Named Item - Practice 1 / Grade 9
Replace a Vague Reference with the Named Item - Practice 2 / Grade 9
Analyze Diction and Unstated Assumptions / Grade 12
Shorten a Sentence without Losing Its Limits - Practice 1 / Grade 12
Shorten a Sentence without Losing Its Limits - Practice 2 / Grade 12
Notice the First Letter - Practice 1 / Kindergarten
Notice the First Letter - Practice 2 / Kindergarten
Notice the Last Letter - Practice 1 / Kindergarten
Notice the Last Letter - Practice 2 / Kindergarten
Hear a Rhyming Pair - Practice 1 / Kindergarten
Hear a Rhyming Pair - Practice 2 / Kindergarten
Explain Day and Night / Grade 2
Put the Planets in Order / Grade 3
Why the Moon Has Phases / Grade 4
Compare Planet Families / Grade 5
Connect Earth's Tilt with Seasons / Grade 6
Gravity and Orbital Motion / Grade 9
Propagate Correlated Astronomical Measurement Errors / Graduate
Warm-Blooded and Cold-Blooded Animals / Grade 2
Sort Warm-Blooded and Cold-Blooded Animals / Grade 3
How Animals Warm Up and Cool Down / Grade 4
Compare Animal Body Temperature Data / Grade 5
Programming Basics: Read a Tiny Program / Grade 1
Programming Basics: Find and Fix a Bug / Grade 2
Programming Basics: Track a Variable / Grade 3
Programming Basics: Choose One Branch / Grade 4
Programming Basics: Repeat a Group of Steps / Grade 5
Programming Basics: Make a While Loop Stop / Grade 6
Programming Basics: Call a Function / Grade 7
Programming Basics: Read and Update a List / Grade 8
Programming Basics: Combine Boolean Conditions / Grade 9
Programming Basics: Test the Edges / Grade 10
Programming Basics: Separate Calculation and Display / Grade 11
Programming Basics: Count the Work / Grade 12
Programming Basics: Prove a Loop Invariant / Undergraduate
Programming Basics: Derive a Weakest Precondition / Graduate
Programming Basics: Put Steps in Order / Kindergarten
Ship a Change Carefully / Grade 6
Read a Release Gate / Grade 9
Electronics Basics: Open or Closed? / Grade 1
Electronics Basics: Conductors and Insulators / Grade 2
Electronics Basics: Match Components to Jobs / Grade 3
Electronics Basics: Voltage Is Not Current / Grade 4
Electronics Basics: Follow a Series Path / Grade 5
Electronics Basics: Follow Parallel Branches / Grade 6
Electronics Basics: Use Ohm's Law Carefully / Grade 7
Electronics Basics: Read an LED Circuit Model / Grade 8
Count Charge Transferred by a Constant Current - Practice 1 / Grade 8
Count Charge Transferred by a Constant Current - Practice 2 / Grade 8
Electronics Basics: Power and Energy / Grade 9
Electronics Basics: Notice Divider Loading / Grade 10
Electronics Basics: Read Logic Levels / Grade 11
Electronics Basics: Trace Capacitor Charging / Grade 12
Electronics Basics: Use a Thevenin Equivalent / Undergraduate
Electronics Basics: Analyze an RC Low-Pass Filter / Graduate
Electronics Basics: Meet the Circuit Parts / Kindergarten
Gravity: Follow the Pull / Grade 1
Falling Speeds: Read the Gaps / Grade 1
Hydraulic Press: Follow a Push / Grade 1
Gravity and Things That Hold Us Up / Grade 2
Falling Speeds: Fair Starts Without Air / Grade 2
Hydraulic Press: Compare Piston Faces / Grade 2
Notice Pushes and Pulls / Grade 3
Gravity and Falling Paper / Grade 3
Wind and Air: Name the Wind / Grade 3
Falling Speeds: Measure Average Speed / Grade 3
Hydraulic Press: Share Pressure, Change Force / Grade 3
Compare Balanced and Unbalanced Forces / Grade 4
Gravity: Plan a Fair Drop Test / Grade 4
Wind and Air: Read Speeds and Gusts / Grade 4
Falling Speeds: Repeat the Measurement / Grade 4
Hydraulic Press: Trade Force for Distance / Grade 4
Gravity Without Air Resistance / Grade 5
Wind and Air: Follow a Sea Breeze / Grade 5
Falling Speeds: Shape and a Fair Test / Grade 5
Hydraulic Press: Audit the Work / Grade 5
Gravity: Calculate Mass and Weight / Grade 6
Wind and Air: Pressure Makes a Push / Grade 6
Falling Speeds: A Speed Increase Each Second / Grade 6
Hydraulic Press: Calculate Pressure / Grade 6
Gravity: Compare Worlds and Scales / Grade 7
Wind and Air: Heating and Weather Models / Grade 7
Falling Speeds: Average Versus Final Speed / Grade 7
Hydraulic Press: Square the Diameter Ratio / Grade 7
Connect Net Force, Mass, and Acceleration / Grade 8
Gravity: Why Satellites Stay in Orbit / Grade 8
Wind and Air: Relative Motion and Drag / Grade 8
Falling Speeds: Terminal Does Not Mean Stopped / Grade 8
Hydraulic Press: Trace Flow and Power / Grade 8
Gravity and the Inverse-Square Rule / Grade 9
Wind and Air: Compressible Gas Models / Grade 9
Falling Speeds: Estimate a Terminal Speed / Grade 9
Hydraulic Press: Track Efficiency and Losses / Grade 9
Gravity: Model Vertical Free Fall / Grade 10
Wind and Air: Flow Through a Narrowing / Grade 10
Falling Speeds: Height, Time and Landing Speed / Grade 10
Hydraulic Press: Include Height Differences / Grade 10
Gravity and Changes in Energy / Grade 11
Wind and Air: Available Wind Power / Grade 11
Falling Speeds: Account for Energy in a Fall / Grade 11
Hydraulic Press: Account for the Piston Rod / Grade 11
Gravity: Circular Orbits and Escape Energy / Grade 12
Wind and Air: Scale an Airflow Experiment / Grade 12
Falling Speeds: Measure Speed with Uncertainty / Grade 12
Hydraulic Press: Keep an Energy Ledger / Grade 12
Gravity Inside and Outside a Uniform Sphere / Undergraduate
Wind and Air: Derive an Atmospheric Profile / Undergraduate
Falling Speeds: Solve the Linear-Drag Model / Undergraduate
Hydraulic Press: Model Fluid Compliance / Undergraduate
Gravity: Tidal Fields and Local Free Fall / Graduate
Wind and Air: Geostrophic Balance and Limits / Graduate
Falling Speeds: Analyze Quadratic-Drag Relaxation / Graduate
Hydraulic Press: Analyze Coupled Dynamics / Graduate
Gravity: What Falls Down? / Kindergarten
Falling Speeds: Watch a Fall / Kindergarten
Hydraulic Press: Spot the Parts / Kindergarten
Look Closely at Rocks / Grade 1
Rocks and Minerals Are Not the Same / Grade 3
Three rock families / Grade 3
Follow More Than One Rock-Cycle Path / Grade 4
Separate Breaking Down from Moving Away - Practice 1 / Grade 4
Separate Breaking Down from Moving Away - Practice 2 / Grade 4
Separate Weathering, Erosion, and Deposition / Grade 5
Weathering and erosion / Grade 5
Read Fossils as Evidence of Past Life / Grade 6
Connect Plate Motion with Boundary Processes / Grade 7
Order Rock Layers and Cutting Events / Grade 8
Read the rock record / Grade 8
Model Half-Life in Rock Dating / Grade 10
Combine Relative Ages with Dating Uncertainty / Grade 12
Scale a Geological Diffusion Model / Undergraduate
Nonunique Geological Mixtures and Independent Tracers / Graduate
Match Habitats to Needs / Grade 2
Choose a Habitat from Stated Needs - Practice 1 / Grade 2
Choose a Habitat from Stated Needs - Practice 2 / Grade 2
Connect Adaptations to Habitats / Grade 3
Follow Energy Through a Food Web / Grade 5
Reason with a Logistic Population Model / Grade 11
Meet the Computer Team / Grade 3
Follow Input, Processing and Output / Grade 4
Keep Working Memory and Saved Files Separate / Grade 5
Memory Is Not Storage / Grade 6
When a Pattern Guesses Wrong / Grade 5
Test a Predictor on Unseen Examples / Grade 8
Use Proton Count to Identify Atomic Number - Practice 1 / Grade 7
Use Proton Count to Identify Atomic Number - Practice 2 / Grade 7
Read Whether a Formula Contains One Element or More - Practice 1 / Grade 7
Read Whether a Formula Contains One Element or More - Practice 2 / Grade 7
Multiply a Subscript by the Number of Molecules - Practice 1 / Grade 7
Multiply a Subscript by the Number of Molecules - Practice 2 / Grade 7
Separate Mass Number from Atomic Number - Practice 1 / Grade 8
Separate Mass Number from Atomic Number - Practice 2 / Grade 8
Check Atom Conservation in a Balanced Model - Practice 1 / Grade 8
Check Atom Conservation in a Balanced Model - Practice 2 / Grade 8
Use Total Solution Mass as the Denominator - Practice 1 / Grade 9
Use Total Solution Mass as the Denominator - Practice 2 / Grade 9
Conserve Solute during an Ideal Dilution - Practice 1 / Grade 9
Conserve Solute during an Ideal Dilution - Practice 2 / Grade 9
Apply an Inverse Pressure-Volume Model - Practice 1 / Grade 10
Apply an Inverse Pressure-Volume Model - Practice 2 / Grade 10
Convert Sample Mass into Moles - Practice 1 / Grade 10
Convert Sample Mass into Moles - Practice 2 / Grade 10
Use a Balanced Equation as a Mole Ratio - Practice 1 / Grade 10
Use a Balanced Equation as a Mole Ratio - Practice 2 / Grade 10
Follow Repeated Half-Life Intervals - Practice 1 / Grade 10
Follow Repeated Half-Life Intervals - Practice 2 / Grade 10
Use Solution Volume in Molarity - Practice 1 / Grade 11
Use Solution Volume in Molarity - Practice 2 / Grade 11
Track a One-to-One Equivalence Calculation - Practice 1 / Grade 11
Track a One-to-One Equivalence Calculation - Practice 2 / Grade 11
Compare a Reaction Quotient with Its Equilibrium Constant - Practice 1 / Grade 12
Compare a Reaction Quotient with Its Equilibrium Constant - Practice 2 / Grade 12
Think about What Green Plants Need - Practice 1 / Grade 1
Think about What Green Plants Need - Practice 2 / Grade 1
Follow a Stated Life-Cycle Sequence - Practice 1 / Grade 1
Follow a Stated Life-Cycle Sequence - Practice 2 / Grade 1
Match Plant Parts with Their Jobs / Grade 2
Use a Seed-Dispersal Structure as a Clue - Practice 1 / Grade 2
Use a Seed-Dispersal Structure as a Clue - Practice 2 / Grade 2
Measure a Seedling's Height Change - Practice 1 / Grade 2
Measure a Seedling's Height Change - Practice 2 / Grade 2
A Green Plant Makes Its Food / Grade 3
Follow Energy through a Food Chain - Practice 1 / Grade 3
Follow Energy through a Food Chain - Practice 2 / Grade 3
Read a Population Count without Guessing Why - Practice 1 / Grade 4
Read a Population Count without Guessing Why - Practice 2 / Grade 4
Photosynthesis and Plant Needs / Grade 5
Follow Energy through a Food Web / Grade 5
Distinguish a Producer from a Consumer - Practice 1 / Grade 5
Distinguish a Producer from a Consumer - Practice 2 / Grade 5
Calculate the Fraction of Seeds That Sprouted - Practice 1 / Grade 5
Calculate the Fraction of Seeds That Sprouted - Practice 2 / Grade 5
Match a Cell Structure to Its Main Stated Role - Practice 1 / Grade 6
Match a Cell Structure to Its Main Stated Role - Practice 2 / Grade 6
Compare Photosynthesis and Cellular Respiration - Practice 1 / Grade 7
Compare Photosynthesis and Cellular Respiration - Practice 2 / Grade 7
Compare Plant and Animal Cells / Grade 8
Include Births, Deaths and Movement - Practice 1 / Grade 9
Include Births, Deaths and Movement - Practice 2 / Grade 9
Use Magnification with Matching Length Units - Practice 1 / Grade 9
Use Magnification with Matching Length Units - Practice 2 / Grade 9
Use an Inheritance Model Without Overclaiming / Grade 11
Read a Simplified Single-Gene Cross - Practice 1 / Grade 11
Read a Simplified Single-Gene Cross - Practice 2 / Grade 11
Compare Energy Transfer between Defined Levels - Practice 1 / Grade 11
Compare Energy Transfer between Defined Levels - Practice 2 / Grade 11
Distinguish Species Richness from Evenness - Practice 1 / Grade 12
Distinguish Species Richness from Evenness - Practice 2 / Grade 12
Enzyme Saturation and Michaelis-Menten Parameters / Undergraduate
Hierarchical Replication and Variance of a Mean / Graduate
Meet the Parts of a Flowering Plant - Practice 1 / Kindergarten
Meet the Parts of a Flowering Plant - Practice 2 / Kindergarten
A Message Across the Room / Grade 4
Put a Packet Message Back in Order / Grade 5
Find a Route in a Paper Network / Grade 6
Names, Addresses and Network Delays / Grade 7
Observe Before You Guess / Grade 1
Notice Colors, Shapes, and Sounds / Kindergarten
Notice What a Picture Actually Shows - Practice 1 / Kindergarten
Notice What a Picture Actually Shows - Practice 2 / Kindergarten
Name the Weather Being Observed - Practice 1 / Kindergarten
Name the Weather Being Observed - Practice 2 / Kindergarten
Choose a Safe Observation Tool - Practice 1 / Kindergarten
Choose a Safe Observation Tool - Practice 2 / Kindergarten
Notice a Shape - Practice 1 / Pre-K
Notice a Shape - Practice 2 / Pre-K
Wind and Air: An Invisible Filling / Grade 1
Compare Solids, Liquids and Gases - Practice 1 / Grade 1
Compare Solids, Liquids and Gases - Practice 2 / Grade 1
Sort Solids, Liquids, and Gases / Grade 2
Wind and Air: A Mixture Around Us / Grade 2
Investigate Mixtures and Dissolving / Grade 3
Use a Magnet Test without Overgeneralizing - Practice 1 / Grade 3
Use a Magnet Test without Overgeneralizing - Practice 2 / Grade 3
Keep Track of Mass in a Closed Container - Practice 1 / Grade 3
Keep Track of Mass in a Closed Container - Practice 2 / Grade 3
Choose a Separation Method from Properties - Practice 1 / Grade 3
Choose a Separation Method from Properties - Practice 2 / Grade 3
Follow Melting, Freezing and Condensing / Grade 4
Add Masses without Inventing a Volume Rule - Practice 1 / Grade 5
Add Masses without Inventing a Volume Rule - Practice 2 / Grade 5
Track Solute after Water Leaves - Practice 1 / Grade 5
Track Solute after Water Leaves - Practice 2 / Grade 5
Compare Mass, Volume and Density / Grade 6
Calculate Density from Mass and Volume - Practice 1 / Grade 6
Calculate Density from Mass and Volume - Practice 2 / Grade 6
Use Average Density in an Ideal Floating Model - Practice 1 / Grade 8
Use Average Density in an Ideal Floating Model - Practice 2 / Grade 8
Conserve Atoms When Balancing Equations / Grade 9
Use Mole Ratios from Balanced Equations / Grade 10
Wind and Air: Notice a Breeze / Kindergarten
Describe a Material by Its Properties - Practice 1 / Kindergarten
Describe a Material by Its Properties - Practice 2 / Kindergarten
Separate Light Sources from Reflectors - Practice 1 / Grade 1
Separate Light Sources from Reflectors - Practice 2 / Grade 1
Locate a Shadow beyond an Opaque Object - Practice 1 / Grade 1
Locate a Shadow beyond an Opaque Object - Practice 2 / Grade 1
Measure Reflection Angles from the Normal - Practice 1 / Grade 5
Measure Reflection Angles from the Normal - Practice 2 / Grade 5
Count Frequency rather than Loudness - Practice 1 / Grade 6
Count Frequency rather than Loudness - Practice 2 / Grade 6
Connect Wavelength, Frequency and Wave Speed - Practice 1 / Grade 8
Connect Wavelength, Frequency and Wave Speed - Practice 2 / Grade 8
Find the Time for One Cycle - Practice 1 / Grade 10
Find the Time for One Cycle - Practice 2 / Grade 10
Relate Photon Energy to Frequency - Practice 1 / Grade 12
Relate Photon Energy to Frequency - Practice 2 / Grade 12
Compare an Absorbency Record - Practice 1 / Grade 2
Compare an Absorbency Record - Practice 2 / Grade 2
Read a Seedling Observation Log / Grade 3
Describe Variation across Repeated Readings - Practice 1 / Grade 3
Describe Variation across Repeated Readings - Practice 2 / Grade 3
Plan a Fair Investigation / Grade 4
Identify a Comparison with One Deliberate Change - Practice 1 / Grade 4
Identify a Comparison with One Deliberate Change - Practice 2 / Grade 4
Compare Repeated Trials / Grade 5
Separate Predictions from Results / Grade 5
Match Conclusions to Measurement Limits / Grade 6
Scale a Sample Density Carefully - Practice 1 / Grade 6
Scale a Sample Density Carefully - Practice 2 / Grade 6
Design a Controlled Comparison / Grade 7
Interpret Confidence Intervals in an Experiment / Grade 12
Propagate Stated Worst-Case Bounds in a Sum - Practice 1 / Grade 12
Propagate Stated Worst-Case Bounds in a Sum - Practice 2 / Grade 12
Compare Thermal Insulation under a Fixed Test - Practice 1 / Grade 4
Compare Thermal Insulation under a Fixed Test - Practice 2 / Grade 4
Keep the Sign of a Temperature Change - Practice 1 / Grade 6
Keep the Sign of a Temperature Change - Practice 2 / Grade 6
Identify the Described Heat-Transfer Mechanism - Practice 1 / Grade 7
Identify the Described Heat-Transfer Mechanism - Practice 2 / Grade 7
Calculate Energy for a Temperature Rise - Practice 1 / Grade 9
Calculate Energy for a Temperature Rise - Practice 2 / Grade 9
Rearrange the Heat Model to Find Specific Heat - Practice 1 / Grade 11
Rearrange the Heat Model to Find Specific Heat - Practice 2 / Grade 11
Connect Heat-Engine Work and Efficiency - Practice 1 / Grade 12
Connect Heat-Engine Work and Efficiency - Practice 2 / Grade 12
Spot Changes at the Rocket Pad / Grade 2
Trace a Swap on a Cargo Grid / Grade 3
Compare Two Space-Cargo Grids / Grade 4
Audit Changes Without Double Counting / Grade 5
What Changed in the Picture? - Practice 1 / Pre-K
What Changed in the Picture? - Practice 2 / Pre-K
Name a Change in Water State - Practice 1 / Grade 2
Name a Change in Water State - Practice 2 / Grade 2
Follow Water as It Changes / Grade 3
Trace Water Along Different Routes / Grade 4
Account for Water in a Simple Model - Practice 1 / Grade 4
Account for Water in a Simple Model - Practice 2 / Grade 4
Hygiene: Give Soap Time to Work / Grade 1
Hygiene: Choose Useful Moments / Grade 2
Hygiene: Cough and Sneeze with Care / Grade 3
Hygiene: Care for All Tooth Surfaces / Grade 4
Hygiene: Build a Respectful Routine / Grade 5
Hygiene: Keep Food Preparation Separate / Grade 6
Hygiene: Clean or Disinfect? / Grade 7
Hygiene: Read a Hand-Sanitizer Label / Grade 8
Hygiene: Question Microbe Myths / Grade 9
Hygiene: Read Absolute and Relative Differences / Grade 10
Hygiene: Separate Measures from Claims / Grade 11
Hygiene: Design a Fair Support Project / Grade 12
Hygiene: Account for Clustered Study Data / Undergraduate
Hygiene: Evaluate Changes Without Overclaiming / Graduate
Hygiene: Put the Steps in Order / Kindergarten
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