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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

Lesson

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

K-5
6-8
9-12

Kindergarten
Grade 1
Grade 2
Grade 3
Grade 4
Grade 5

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
Unit 9

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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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.

Standards Alignment

Building On

Addressing

2.NBT.2

Count within 1000; skip-count by 2s, 5s, 10s, and 100s.

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Building Toward

2.NBT.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Standards Alignment

Building On

Addressing

2.NBT.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Building Toward

Standards Alignment

Building On

Addressing

2.NBT.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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2.NBT.9

Explain why addition and subtraction strategies work, using place value and the properties of operations.

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Building Toward