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K-5 Grade 3 Unit 2 Lesson 12

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•K-5 Math 6-8 Math 9-12 Math

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Kindergarten Grade 1 Grade 2 •Grade 3 Grade 4 Grade 5

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Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 •Lesson 12 Lesson 13 Lesson 14 Lesson 15

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Lesson 12

Warm-up Activity 1 Activity 2

Unit 2, Lesson 12

Area and Addition

Grade 3

Warm-up

Find the value of each expression mentally.

Activity 1

This rectangle represents space in a community garden. The shaded part has vegetables, and the unshaded part has flowers. Each grid square represents 1 square foot.

What is the area of the whole space?
Design your own rectangular garden that has at least 2 parts. Find the area of each part of the garden and the area of the whole garden.

Activity 2

What do you notice? What do you wonder?

A figure divided into equal sized square units.

Find the area of this figure. Explain or show your reasoning. Organize your explanation so it can be followed by others.