Unit 4 - Lesson 4 - Grade 5: Illustrative Mathematics

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Note from the author:

Grade 5 Unit 4
Lesson 4: Standard Algorithm: One-digit and Multi-digit
CC BY 2021 Illustrative Mathematics®

Instructions

Grade 5 Unit 4
Lesson 4: Standard Algorithm: One-digit and Multi-digit
CC BY 2021 Illustrative Mathematics®

Lesson: Standard Algorithm: One-digit and Multi-digit

Number Talk: Partial Product (Warm Up)

Find the value of each product mentally.

Compose with the Standard Algorithm

Here is how Han calculated 318 x 3 using partial products.

Here is how Elena calculated 318 x 3 using the standard algorithm.

What does the 2 in Elena’s calculation represent? Explain or show your reasoning.

Use the Standard Algorithm

Calculate each product using Elena’s strategy.

Cool Down: Standard Algorithm Calculation