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Unit 7 - Lesson 12 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 7
Lesson 12: Rectangles with the Same Area
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 7
Lesson 12: Rectangles with the Same Area
CC BY 2021 Illustrative Mathematics®
Lesson: Rectangles with the Same Area

Number Talk: Divide in Parts (Warm Up)

Find the value of each expression mentally.

Area of 24

Draw as many different rectangles as you can with an area of 24 square units.

Find the perimeter of each rectangle you drew. Explain or show your reasoning.

Same Area, Different Perimeter

Draw 2 rectangles with the area of 12 square units but different perimeters.

Draw 2 rectangles with the area of 20 square units but different perimeters.

Draw 2 rectangles with the area of 42 square units but different perimeters.

Draw 2 rectangles with the area of 48 square units but different perimeters.

Draw 2 rectangles with an area you chose but different perimeters.

Choose the rectangles you want to share and place them on the appropriate poster. Try to look for rectangles that are different from what other groups have already placed.

Gallery Walk

As you visit the posters, discuss something you notice.

As you visit the posters, discuss something you wonder.

Cool Down: Area of 36

Draw two rectangles that each have an area of 36 square units but different perimeters.

Explain or show your reasoning.