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K-5 Grade 5 Unit 2 Lesson 9

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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 9

Warm-up Activity 1 Activity 2

Unit 2, Lesson 9

Relate Area to Multiplication

Grade 5

Warm-up

Which 3 go together?

Rectangle. Width: 6. Height: 1. — A

Rectangle divided into same-sized squares. Width: 1. Height: 6. — B

Area diagram. Triangle. Base: 4. Height: 3. — C

Area diagram. Length, 12. Width, 1 half. — D

Activity 1

Find the area of the shaded region in square units. Explain or show your reasoning.

Activity 2

Represent each rectangle on grid paper:
- unit by 1 unit
- unit by 2 units
- unit by 3 units
- unit by 4 units
Find the area of each rectangle that you drew.
What information do you need in order to find the area of the shaded region?
What might the area of the shaded region be? Explain or show your reasoning.