1
What do you notice?
What do you notice?
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What do you wonder?
What do you wonder?
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®
What do you notice?
What do you wonder?
Here are two algorithms for adding 367 + 231.
Han’s algorithm
Elena’s algorithm
Discuss with your partner:
How is Elena’s algorithm different from Han’s algorithm?
Discuss with your partner:
Why do both algorithms work?
Here are two algorithms for adding 365 + 182.
Han’s algorithm
Elena's algorithm
How do the algorithms show the 14 tens differently?
Try Elena’s algorithm to find the value of the sum.
174 + 352
Try Elena’s algorithm to find the value of the sum.
273 + 619
Use an algorithm of your choice to find the value of 365 + 182.
Try Elena’s algorithm to find the value of the sum.
354 + 198
Try Elena’s algorithm to find the value of the sum.
525 + 376
