Unit 4, Lesson 10, Grade 3 icon
Unit 4, Lesson 10

Apply the distributive property to find the total area of rectangle by adding two products

EngageNY 60 min(s)

In this lesson, students apply knowledge of the distributive property to find area. They relate earlier experiences decomposing arrays to using the distributive property to determine the unknown side length of a rectangle. For example, if a rectangle has an area of 72 square units, students might decompose the area into an 8 by 5 rectangle and an 8 by 4 rectangle. The sum of the side lengths, 5 + 4, gives the length of the unknown side.

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