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Unit 3 - Lesson 6 - Grade 3: Illustrative Mathematics
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Lesson: Use Strategies and Algorithms to Add
1
Cool Down: Algorithm or Another Strategy?
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Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Number Talk: Little More, Little Less (Warm Up)
Find the value of each expression mentally.
1
Question 1
1.
300 + 156
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Question 2
2.
299 + 156
1
Question 3
3.
303 + 156
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Just Ones
Question 5
5.
Two methods of recording the addition of 657 + 286 are shown.
How is the newly composed ten and hundred recorded differently in each method?
Try the second method of recording to add these numbers:
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Question 6
6.
602 + 179
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Question 7
7.
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1
How Would You Add?
Use a strategy of your choice to find the value of each sum. Show your reasoning. Organize it so it can be followed by others.
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Question 10
10.
199 + 348
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1
1
1
Question 15
15.
Would you use an algorithm or another strategy to find the value of 299 + 179?
Explain your reasoning.
Question 4
4.
204 + 376
493 + 161
Question 8
8.
438 + 364
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Question 9
9.
329 + 381
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Question 11
11.
264 + 359
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Question 12
12.
203 + 75
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Question 13
13.
316 + 198
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Question 14
14.
399 + 499
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