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K-5 Grade 5 Unit 5 Lesson 17

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Lesson 17

Warm-up Activity 1 Activity 2

Unit 5, Lesson 17

Multiply Decimals and Whole Numbers

Grade 5

Warm-up

Decide if each statement is true or false. Be prepared to explain your reasoning.

Activity 1

How many do you see?

Find the value of each expression in a way that makes sense to you. Explain or show your reasoning. Use the diagrams if they are helpful.

Activity 2

Find the value of each expression. Explain or show your reasoning.
Kiran writes this explanation to describe the strategy he used to multiply a whole number by some tenths:

“I just turn the numbers into whole numbers, multiply them, and call them tenths.”

Fill in the blanks to show how Kiran’s strategy works.

______ tenths = ______ tenths = 4.2

______ hundredths = ______ hundredths = ____________