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Unit 3 - Lesson 11 - Grade 3: Illustrative Mathematics
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Lesson: Analyze Subtraction Algorithms
Cool Down: Subtraction Reflection
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Grade 3 Unit 3
Lesson 11: Analyze Subtraction Algorithms
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 11: Analyze Subtraction Algorithms
CC BY 2021 Illustrative Mathematics®
Number Talk: Subtract within 1,000 (Warm Up)
Find the value of each expression mentally.
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Question 1
1.
400 - 200
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Question 2
2.
450 - 200
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Question 3
3.
450 - 205
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Compare Two Subtraction Algorithms
The first steps of two algorithms are shown.
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Question 5
5.
How are the steps different?
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Question 6
6.
Use Algorithm A to find the value of 824 - 541.
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Use an Algorithm?
Noah wanted to find the value of 301 - 167 and wrote:
Elena said that we can’t subtract this way because we would need more ones to subtract 7 ones, but there’s a zero in the tens place of 301.
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Question 8
8.
Do you agree with Elena's statement? Explain your reasoning.
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Question 9
9.
Show how you would use an algorithm (either Noah's or another algorithm) to find the difference between 301 and 167.
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You’ve learned many ways to subtract large numbers, including strategies and algorithms.
Question 10
10.
What is your favorite way to subtract large numbers?
Question 11
11.
What’s a way that you would like to learn more about and use more?
Question 4
4.
450 - 215
Question 7
7.
Use Algorithm B to find the value of 824 - 541.
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