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Unit 1- Lesson 15 - Grade 2: Illustrative Mathematics

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Grade 2 Unit 1
Lesson 15: Diagrams with All Kinds of Compare Problems
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 1
Lesson 15: Diagrams with All Kinds of Compare Problems
CC BY 2021 Illustrative Mathematics®
Lesson: Diagrams with All Kinds of Compare Problems

Number Talk: 10 and Some More (Warm Up)

Find the value of each sum mentally.
1.

2.

3.

4.

Shell Collections

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

5.

Use the story problem to complete the diagram.

6.

Write an equation to show how you could find the unknown number of shells. Use a question mark to represent the unknown.

Card Sort: At the Beach

  • Read a card with a story problem.
  • Find cards that match the story problem.
7.

Explain why the cards match.

Cool Down: At the Beach
8.

Children found shells and rocks at the beach. They found 8 more shells than rocks. They found 19 rocks. How many shells did the children find?

Circle the diagram that matches the story problem.

9.

Explain how you know the diagram matches the story.