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Unit 4 - Lesson 15 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 4
Lesson 15: Equal Groups, Larger Numbers
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 4
Lesson 15: Equal Groups, Larger Numbers
CC BY 2021 Illustrative Mathematics®
Lesson: Equal Groups, Larger Numbers

Which One Doesn’t Belong: Rectangles (Warm Up)

1.

Which one doesn’t belong?

Equal Groups, Larger Numbers

2.

Solve the problem. Explain or show your reasoning.

Noah sees a large painted mural that has side lengths of 15 feet and 4 feet. What is the area of the mural?

3.

Solve the problem. Explain or show your reasoning.

Noah’s family buys a mosaic that has 12 rows and 8 columns of 1 inch tiles. What is the area of the mosaic?

4.

Solve the problem. Explain or show your reasoning.

At the art festival, Noah uses sidewalk chalk to help decorate a rectangular piece of sidewalk that is 6 feet by 14 feet. What is the area of the piece of sidewalk that Noah helped decorate?

5.

Solve the problem. Explain or show your reasoning.

At the art festival, Noah buys a pack of stickers. There are 5 sheets and each sheet has 16 stickers. How many stickers are in the pack?

Gallery Walk: Equal Groups, Larger Numbers

6.

As you visit the posters with your partner, discuss what is the same about the thinking shown on each poster.

7.

As you visit the posters with your partner, discuss what is different about the thinking shown on each poster.

Cool Down: Find the Area
8.

A rectangle is 6 feet by 15 feet. What is the area of the rectangle? Explain or show your
reasoning.