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Unit 3 - Lesson 12 - Grade 3: Illustrative Mathematics

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26 Questions
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Grade 3 Unit 3
Lesson 12: Subtract Strategically
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 12: Subtract Strategically
CC BY 2021 Illustrative Mathematics®
Lesson: Subtract Strategically

Number Talk: Threes (Warm Up)

Find the value of each expression mentally.
1.

2 x 6

2.

3 x 6

3.

2 x 7

4.

3 x 7

How Would You Subtract?

  • Use a strategy or algorithm of your choice to find the value of each difference.
  • Show your reasoning. Organize it so it can be followed by others.
5.

451 - 329

6.

382 - 190

7.

924 - 285

8.

600 - 478

9.

505 - 417

Greatest Difference, Smallest Difference

Directions:
  1. Decide with your partner whether you will try to make the greatest difference or smallest difference.
  2. Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
  3. Find the difference.
  4. Compare your values.
  5. Write a comparison using >, <, or =.
  6. Play again.

Round 1

10.
We will make the __________ difference.
11.

Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.

12.

Find the difference.

Compare your values.
13.
My number __________ my partner's number
Play again.

Round 2

14.
We will make the __________ difference.
15.

Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.

16.

Find the difference.

Compare your values.
17.
My number __________ my partner's number
Play again.

Round 3

18.
We will make the __________ difference.
19.

Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.

20.

Find the difference.

Compare your values.
21.
My number __________ my partner's number
Play again.

Round 4

22.
We will make the __________ difference.
23.

Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.

24.

Find the difference.

Compare your values.
25.
My number __________ my partner's number
Play again.
Cool Down: An Algorithm or Another Strategy?
26.

How would you find the value of 700 - 599? Explain your reasoning.