Unit 7 - Lesson 7 - Grade 3: Illustrative Mathematics

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Last updated 7 months ago

21 questions

Note from the author:

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

Instructions

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)

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

Explain your reasoning.

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

Explain your reasoning.

123 + 75 + 123 + 75 = 208 + 208

Explain your reasoning.

123 + 75 + 123 + 75 = 246 + 150

Explain your reasoning.

All Kinds of Shapes

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

Shape #1

I chose shape__________

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

Shape #2

I chose shape__________

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

Shape #3

I chose shape__________

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

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

Draw 2 shapes with the perimeter of 12 units.

Draw 2 shapes with the perimeter of 26 units.

Draw 2 shapes with the perimeter of 48 units.

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

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

Cool Down: Create Your Own Shapes

Unit 7 - Lesson 7 - Grade 3: Illustrative Mathematics

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

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

Explain your reasoning.

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

Explain your reasoning.

123 + 75 + 123 + 75 = 208 + 208

Explain your reasoning.

123 + 75 + 123 + 75 = 246 + 150

Explain your reasoning.

All Kinds of Shapes

Shape #1

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

Shape #2

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

Shape #3

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

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

Draw 2 shapes with the perimeter of 12 units.

Draw 2 shapes with the perimeter of 26 units.

Draw 2 shapes with the perimeter of 48 units.

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

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

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