Grade 2 · Math · Lesson 28

Measure with Rulers Accurately

A ruler is a measuring tool marked with two scales. In the United States, a standard ruler shows inches (in) along the top edge and centimeters (cm) along the bottom edge. Measuring accurately means following three rules every time.

What this lesson teaches

1Place a ruler correctly with the zero mark at the start of an object
2Read the inch or centimeter mark at the other end to find the length
3Know common classroom-object lengths in inches and centimeters
4Read both edges of a dual-scale US ruler (inches on top, centimeters on bottom)

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