Unit 3 - Lesson 8 - Grade 3: Illustrative Mathematics

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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)

Number Talk: Subtraction Strategies (Warm Up)

Find the value of each expression mentally.

From Drawings to an Algorithm

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

Card Sort: Diagrams and Algorithms

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

Cool Down: Connect a Diagram and an Algorithm

Number Talk: Subtraction Strategies (Warm Up)