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Unit 7 - Lesson 7 - Grade 3: Illustrative Mathematics

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21 Questions
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Grade 3 Unit 7
Lesson 7: Same Perimeter, Different Shapes
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 7
Lesson 7: Same Perimeter, Different Shapes
CC BY 2021 Illustrative Mathematics®
Lesson: Same Perimeter, Different Shapes

True or False: Sums of Four Numbers (Warm Up)

1.

123 + 75 + 123 + 75 = 100 + 100 + 70 + 70 + 5 + 5 + 3 + 3

2.

Explain your reasoning.

3.

123 + 75 + 123 + 75 = (2 x 123) + (2 x 75)

4.

Explain your reasoning.

5.

123 + 75 + 123 + 75 = 208 + 208

6.

Explain your reasoning.

7.

123 + 75 + 123 + 75 = 246 + 150

8.

Explain your reasoning.

All Kinds of Shapes

  1. Choose any 3 shapes and find the perimeter of each shape. Explain or show your reasoning.

Shape #1

9.
I chose shape__________
10.

What is the perimeter of the shape? Explain or show your reasoning.

Shape #2

11.
I chose shape__________
12.

What is the perimeter of the shape? Explain or show your reasoning.

Shape #3

13.
I chose shape__________
14.

What is the perimeter of the shape? Explain or show your reasoning.

15.

Find one shape that has the same perimeter as one of the shapes you chose earlier. Be prepared to explain your reasoning.

Draw Your Own

16.

Draw 2 shapes with the perimeter of 12 units.

17.

Draw 2 shapes with the perimeter of 26 units.

18.

Draw 2 shapes with the perimeter of 48 units.

19.

With your partner, choose a length. Then, draw your own shape with that perimeter.

20.

Share the shapes you drew and discuss how they are alike and how they are different.

Cool Down: Create Your Own Shapes
21.

Draw 2 different shapes that have a perimeter of 32 units.