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K-5 Grade 3 Unit 3 Lesson 3

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•K-5 Math 6-8 Math 9-12 Math

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Kindergarten Grade 1 Grade 2 •Grade 3 Grade 4 Grade 5

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Unit 1 Unit 2 •Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8

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Lesson 1 Lesson 2 •Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19 Lesson 20 Lesson 21

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IM K-5 Math
IM 6-8 Math
IM 9-12 Math

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Lesson 3

Warm-up Activity 1 Activity 2

Unit 3, Lesson 3

Add Your Way

Grade 3

Warm-up

Find the value of each expression mentally.

Students working together.

Activity 1

Find the value of each sum in any way that makes sense to you. Explain or show your reasoning.

Activity 2

Andre found the value of . His work is shown.

Clare found the value of . Her work is shown.

With your partner, discuss:

What’s different about Clare's and Andre’s work?
What’s the same?