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K-5 Grade 2 Unit 1 Lesson 15

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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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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

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Lesson 15

Warm-up Activity 1 Activity 2

Unit 1, Lesson 15

Diagrams with All Kinds of Compare Problems

Grade 2

Warm-up

Find the value of each sum mentally.

Activity 1

Diego has 55 shells. Lin has 20 fewer shells than Diego.

Use the story problem to complete the diagram.
Write an equation to find the unknown number of shells. Use ? to represent the unknown.

Student on the beach

Activity 2

Read a story problem card.
Match each story problem to a diagram and an equation.
Be prepared to explain your reasoning.