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Unit 3 - Lesson 5 - Grade 3: Illustrative Mathematics
By Formative Library
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Instructions
Lesson: Another Addition Algorithm
Cool Down: Use an Algorithm for Addition
1
Grade 3 Unit 3
Lesson 5: Another Addition Algorithm
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 5: Another Addition Algorithm
CC BY 2021 Illustrative Mathematics®
Notice and Wonder: Another Curious Table (Warm Up)
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A New Addition Algorithm
Here are two algorithms for adding 367 + 231.
Han’s algorithm
Elena’s algorithm
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Compose New Units
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Question 10
10.
Use an algorithm of your choice to find the value of 365 + 182.
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Question 1
1.
What do you notice?
Question 2
2.
What do you wonder?
Question 3
3.
Discuss with your partner:
How is Elena’s algorithm different from Han’s algorithm?
Question 4
4.
Discuss with your partner:
Why do both algorithms work?
Here are two algorithms for adding 365 + 182.
Han’s algorithm
Elena's algorithm
Question 5
5.
How do the algorithms show the 14 tens differently?
Question 6
6.
Try Elena’s algorithm to find the value of the sum.
174 + 352
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Question 7
7.
Try Elena’s algorithm to find the value of the sum.
273 + 619
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Question 8
8.
Try Elena’s algorithm to find the value of the sum.
354 + 198
visibility
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Question 9
9.
Try Elena’s algorithm to find the value of the sum.
525 + 376
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