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Unit 3 - Lesson 4 - Grade 3: Illustrative Mathematics

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8 Questions
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Grade 3 Unit 3
Lesson 4: Introduction to Addition Algorithms
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 4: Introduction to Addition Algorithms
CC BY 2021 Illustrative Mathematics®
Lesson: Introduction to Addition Algorithms

Which One Doesn’t Belong: 247 (Warm Up)

1.

Which one doesn’t belong?

What is an Algorithm?

Three students found the value of 362 + 354. Their work is shown. Explain how each method works.

2.

Tyler’s drawing.

3.

Lin’s method.

4.

Han’s method.

Try an Algorithm

Try using an algorithm to find the value of each sum. Show your thinking. Organize it so it can be followed by others.
5.

475 + 231

6.

136 + 389

7.

670 + 257

Cool Down: Choose an Algorithm
8.

A diagram of the base-ten blocks that represent 138 + 425 is shown.


Use an algorithm you learned in today's lesson to find the value of the sum.