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Unit 4 - Lesson 5 - Grade 5: Illustrative Mathematics

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Hyɛ no nsow a efi ɔkyerɛwfo no hɔ:

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)

Compare Two Algorithms

Use the Standard Algorithm

Cool Down: Standard Algorithm without Composition of a New Unit
1

Find the value of each product mentally.

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1.

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2.

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3.

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4.

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

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5.

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

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6.

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

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7.

How do the final steps in the two algorithms compare?

Use the standard algorithm to find the value of each expression.

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8.

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9.

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10.

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12.

Use the standard algorithm to find the value of 203 x 23.

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11.

Diego found the value of 301 x 24. Here is his work. Why doesn’t Diego’s answer make sense?