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Unit 7 - Lesson 4 - Grade 2: Illustrative Mathematics

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13 Questions
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Grade 2 Unit 7
Lesson 4: Add and Subtract Three-digit Numbers in Different Ways
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 4: Add and Subtract Three-digit Numbers in Different Ways
CC BY 2021 Illustrative Mathematics®
Lesson: Add and Subtract Three-digit Numbers in Different Ways

Number Talk: Count Back by Place (Warm Up)

Find the value of each expression mentally.
1.

586 - 100

2.

486 - 20

3.

457 - 200

4.

257 - 30

Zero Tens and Zero Ones

Mai and Lin were asked to find the value of 500 - 387.

Here is their work.


Find the value of each expression.

Show your thinking.
5.

Try Mai’s way to find the value of
600 - 476.

6.

Try Lin’s way to find the value of
400 - 134.

Add or Subtract with Expanded Form

Andre and Diego showed their thinking with equations to find the value of 427 + 351.

7.

What is the same or different about their work?

Discuss with your partner.
8.

Try Andre’s way to find the value of
725 + 243.

9.

Try Diego’s way to find the value of
863 - 432.

10.

Choose your own way to find the value of 163 + 326. Show your thinking.

11.

Choose your own way to find the value of 692 - 571. Show your thinking.

Cool Down: Find the Sum, Find the Difference
Find the value of each expression. Show your thinking.
12.

382 + 216

13.

700 - 428