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Unit 3 - Lesson 12 - Grade 3: Illustrative Mathematics
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Lesson: Subtract Strategically
Cool Down: An Algorithm or Another Strategy?
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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®
Number Talk: Threes (Warm Up)
Find the value of each expression mentally.
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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.
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Greatest Difference, Smallest Difference
Directions:
Decide with your partner whether you will try to make the greatest difference or smallest difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
Compare your values.
Write a comparison using >, <, or =.
Play again.
Round 1
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Round 2
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Round 3
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Round 4
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Question 26
26.
How would you find the value of 700 - 599? Explain your reasoning.
Question 1
1.
2 x 6
Question 2
2.
3 x 6
Question 3
3.
2 x 7
Question 4
4.
3 x 7
Question 5
5.
451 - 329
visibility
View drawing
Question 6
6.
382 - 190
visibility
View drawing
Question 7
7.
924 - 285
visibility
View drawing
Question 8
8.
600 - 478
visibility
View drawing
Question 9
9.
505 - 417
visibility
View drawing
Question 10
10.
We will make the __________ difference.
Question 11
11.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
visibility
View drawing
Question 12
12.
Find the difference.
visibility
View drawing
Compare your values.
Question 13
13.
My number __________ my partner's number
Play again.
Question 14
14.
We will make the __________ difference.
Question 15
15.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
visibility
View drawing
Question 16
16.
Find the difference.
visibility
View drawing
Compare your values.
Question 17
17.
My number __________ my partner's number
Play again.
Question 18
18.
We will make the __________ difference.
Question 19
19.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
visibility
View drawing
Question 20
20.
Find the difference.
visibility
View drawing
Compare your values.
Question 21
21.
My number __________ my partner's number
Play again.
Question 22
22.
We will make the __________ difference.
Question 23
23.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
visibility
View drawing
Question 24
24.
Find the difference.
visibility
View drawing
Compare your values.
Question 25
25.
My number __________ my partner's number
Play again.