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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)

Area of 24

1
1

Same Area, Different Perimeter

1
1
1
1
1
1
Cool Down: Area of 36
1
1

Find the value of each expression mentally.

1
Pitanje 1
1.

1
Pitanje 2
2.

1
Pitanje 3
3.

1
Pitanje 4
4.

Pitanje 5
5.

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

Pitanje 6
6.

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

Pitanje 7
7.

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

Pitanje 8
8.

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

Pitanje 9
9.

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

Pitanje 10
10.

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

Pitanje 11
11.

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

Pitanje 12
12.

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

1
Pitanje 13
13.

As you visit the posters, discuss something you notice.

1
Pitanje 14
14.

As you visit the posters, discuss something you wonder.

Pitanje 15
15.

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

Pitanje 16
16.

Explain or show your reasoning.