Map scale: a small line, a longer trip

A map shrinks the trip

A map lets a long trip fit on a small page. Our practice scale says one centimeter on the printed map stands for two hundred meters in the real place. Always read the stated scale. A line on your screen may look larger or smaller when you zoom.

Use the scale once for each unit

The diagram shows a three-centimeter map segment. Each centimeter represents two hundred meters. Three groups of two hundred make six hundred meters. Write the real-world unit with the answer so we do not mistake six hundred meters for six hundred centimeters on the map.

A trip can have two parts

Imagine a fictional trip from school to a park, then from the park to a library. The first map segment is four centimeters and the next is three. Add the segments because we travel both. Seven centimeters on this map represent fourteen hundred meters altogether.

Compare with a direct route

Suppose a direct school-to-library route measures five centimeters on the same map. The route through the park is seven. Their difference is two centimeters, which represents four hundred meters. Compare routes using the same scale. The shortest drawn route still needs to be a permitted route.

Pause: work back to the map

Pause and work backward. A route is eighteen hundred meters long in the real place. On this map, one centimeter represents two hundred meters. How many groups of two hundred are in eighteen hundred? Your answer should be a map length in centimeters.

Check by converting it back

Eighteen hundred divided by two hundred is nine. The map length is nine centimeters. Check by multiplying nine by two hundred: that returns eighteen hundred meters. Keeping both units in view helps you tell which way you are converting.

Zooming does not move the library

Fun fact: making a map image twice as large does not make the actual trip twice as long. The library stays where it is, even if its label fills your screen. Use stated map measurements or a correctly resized scale bar instead of guessing from screen size.

Plan a route and explain it

Continue to the route worksheet. Read its scale, convert each distance, and add only the segments the route actually uses. When comparing two routes, subtract their lengths in the same units. A clear calculation should tell another traveler exactly which trip you measured.