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K-5 Grade 2 Unit 2 Lesson 2

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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 Unit 9

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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

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9-12

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

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Lesson 2

Warm-up Activity 1 Activity 2

Unit 2, Lesson 2

Find the Unknown Addend

Grade 2

Warm-up

None

Activity 1

How are the tools alike? How are they different?
Find the number that makes the equation true. Show your thinking using drawings, numbers, or words.

Activity 2

Han and Mai use blocks to find the number that makes the equation true.

Han uses blocks to show 17. Show how to find the number that makes the equation true.
Mai uses blocks to show 48. Show how to find the number that makes the equation true.
Work with a partner. One partner starts with 21. The other partner starts with 96.
Show your partner how you found the number that makes the equation true.