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Unit 3 - Lesson 8 - Grade 3: Illustrative Mathematics

Last updated 11 months ago

9 questions

Note from the author:

Grade 3 Unit 3
Lesson 8: Subtraction Algorithms (Part 1)
CC BY 2021 Illustrative Mathematics®

Instructions

Grade 3 Unit 3
Lesson 8: Subtraction Algorithms (Part 1)
CC BY 2021 Illustrative Mathematics®

Lesson: Subtraction Algorithms (Part 1)

1

Cool Down: Connect a Diagram and an Algorithm

1

Number Talk: Subtraction Strategies (Warm Up)

Find the value of each expression mentally.

1

Question 1

1.

100 - 98

1

Question 2

2.

101 - 99

1

Question 3

3.

200 - 98

1

Question 4

4.

204 - 98

From Drawings to an Algorithm

Jada and Kiran found the value of 391 - 215. Their work is shown.

1

Question 5

5.

Explain how Kiran’s algorithm starts.

1

Question 6

6.

Explain how Kiran recorded the decomposition of the ten into more ones.

1

Question 7

7.

Finish Kiran’s work.

Card Sort: Diagrams and Algorithms

Your teacher will give you a set of cards. Match each diagram with an algorithm.

Question 8

8.

Match each diagram with an algorithm.

Draggable item		Corresponding Item

Question 9

9.

Explain how the diagram matches the algorithm.