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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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Kindergarten Grade 1 Grade 2 •Grade 3 Grade 4 Grade 5

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Unit 1 Unit 2 •Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8

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Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 •Lesson 8 Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19 Lesson 20 Lesson 21

K-5
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9-12

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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.

Standards Alignment

Building On

Addressing

3.NBT.2

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

View Full Standard

Building Toward

Standards Alignment

Building On

Addressing

3.NBT.2

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

View Full Standard

Building Toward

Standards Alignment

Building On

Addressing

3.NBT.2

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

View Full Standard

Building Toward