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K-5 Grade 3 Unit 3 Lesson 8

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•K-5 Math 6-8 Math 9-12 Math

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Lesson 8

Warm-up Activity 1 Activity 2

Unit 3, Lesson 8

Subtraction Algorithms (Part 1)

Grade 3

Warm-up

Find the value of each expression mentally.

Activity 1

Jada and Kiran each found the value of . Their work is shown.

Jada’s drawing

Student representation of a base ten diagram with 3 hundreds, 2 crossed out, 9 tens with 2 crossed out with arrow pointing to 1 ten with 4 crossed out and a one, crossed out.

Kiran’s algorithm

<p>Subtraction. Three-hundred plus ninety plus one, minus two-hundred plus ten plus five.</p>

Explain how Kiran’s algorithm starts.
Explain how Kiran recorded decomposing 1 ten into more ones.
Finish Kiran’s work.

Activity 2

Your teacher will give you a set of cards. Match each diagram to an algorithm. Be ready to explain your reasoning.