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Unit 3 - Lesson 5 - Grade 3: Illustrative Mathematics

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10 Questions
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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®
Lesson: Another Addition Algorithm

Notice and Wonder: Another Curious Table (Warm Up)

What do you notice?

What do you wonder?

A New Addition Algorithm

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?

Compose New Units

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

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

Cool Down: Use an Algorithm for Addition

Use an algorithm of your choice to find the value of 365 + 182.