Grade 3 · Math · Lesson 24

Measure Area with Unit Squares

Area is the amount of surface a shape covers. We measure area in square units. To find the area of a shape on a grid, count how many unit squares fit inside it. Each unit square can be 1 in × 1 in (one square inch, in²) or 1 cm × 1 cm (one square centimeter, cm²). The math is the same in both unit systems — just keep your units consistent.

What this lesson teaches

1Count unit squares to find the area of a shape in both square inches (in²) and square centimeters (cm²)
2Compare areas of different shapes on a grid using square inches and square centimeters

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