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Unit 7 - Lesson 16 - Grade 2: Illustrative Mathematics

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Grade 2 Unit 7
Lesson 16: Subtract Within 1,000
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 16: Subtract Within 1,000
CC BY 2021 Illustrative Mathematics®
Lesson: Subtract Within 1,000

True or False: Equations Based on Place Value (Warm Up)

Decide if each statement is true or false. Be prepared to explain your reasoning.
1.

2 hundreds + 3 tens + 4 ones =
2 hundreds + 3 tens + 14 ones

2.

2 hundreds + 3 tens + 4 ones =
1 hundred + 13 tens + 4 ones

3.

1 hundred + 13 tens + 4 ones =
1 hundred + 12 tens + 14 ones

Jada’s Thinking

4.

Discuss how Jada’s equations match Lin’s diagram.

5.

Finish Jada’s work to find the value of 582 - 145.

Jada is thinking about how to find the value of 402-298.
6.

Jada says she knows a way to count on to find the difference. She showed her thinking using a number line.


Explain Jada’s thinking.

7.

Jada says you can’t decompose to find the value of because there aren’t any tens.

Do you agree with Jada? Use base-ten blocks, diagrams, or other representations to show your
thinking.

Find It Your Way

Find the value of each expression in a way that makes sense to you. Show your thinking. Organize it so it can be followed by others.
8.

525 - 214

9.

700 - 589

10.

683 - 398

11.

918 - 608

12.

735 - 457

13.

602 - 487

Cool Down: Find the Difference Your Way
14.

Choose one expression and find the value by subtracting by place.

Show your thinking.

15.

Explain why you chose that expression.

16.

Choose a different expression and find the value using a different method.

Show your thinking.

17.

Explain why you chose that expression.