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Science / Visual comparison / Grade 4 / sv491

Compare Two Space-Cargo Grids

Use coordinates to separate a count change, a shape change and a moved item.

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Learn the skill

Read columns A and B from left to right and rows 1 and 2 from top to bottom in these diagrams. Compare the same cell in both grids. Describe whether an item changed shape, changed count or moved. State the row convention instead of assuming all grids use the same one.

Worked example

If a triangle is in A2 in the first grid and B2 in the second, it moved. That does not mean an extra triangle was created. Check both its old cell and new cell.

Before: A1 circle, B1 two crates, A2 triangle, B2 empty. After: A1 diamond, B1 three crates, A2 empty, B2 triangle. Rows run top to bottom.
Rows 1 and 2 go down. One move changes two cells.

Cargo Before and After

Before: A1 has one circle; B1 has two square crates; A2 has one triangle; B2 is empty. After: A1 has one diamond; B1 has three square crates; A2 is empty; B2 has one triangle. Use the words as an equivalent way to inspect the grids. Find three object-level changes; a move affects two cells but counts as one moved object here.

Question 1 Which cell changes from a circle to a diamond?
Question 2 How many square crates are added in B1?
Question 3 Where does the triangle move?
Question 4 How many objects are in the After grid in total?
Question 5 Why are four changed cells not four separate object-level changes here?