Unit 4 - Lesson 5 - Grade 5: Illustrative Mathematics

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12 questions
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Grade 5 Unit 4
Lesson 5: Standard Algorithm: Multi-digit Numbers
CC BY 2021 Illustrative Mathematics®
Grade 5 Unit 4
Lesson 5: Standard Algorithm: Multi-digit Numbers
CC BY 2021 Illustrative Mathematics®
Lesson: Standard Algorithm: Multi-digit Numbers

Number Talk: Partial Products (Warm Up)

Find the value of each product mentally.
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Compare Two Algorithms

Two algorithms for finding the value of 413 x 21 are shown.

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How are the two algorithms the same? How are they different?

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Explain or show where you see each step from the first algorithm in the second algorithm.

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How do the final steps in the two algorithms compare?

Use the Standard Algorithm

Use the standard algorithm to find the value of each expression.
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Diego found the value of 301 x 24. Here is his work. Why doesn’t Diego’s answer make sense?

Cool Down: Standard Algorithm without Composition of a New Unit
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Use the standard algorithm to find the value of 203 x 23.