Unit 5, Section C

Multiply Decimals

Grade 5

Practice

1. Problem 1

   ForLesson 17: Multiply Decimals and Whole Numbers

   Student Task Statement

   

   

   1. Shade the first diagram to represent .
   2. What is the value of ? Explain or show your reasoning.
   3. What is the value of ? Use the second diagram if it is helpful.

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2. Problem 2

   ForLesson 18: Use Whole Number Facts

   Student Task Statement

   1. Mai says that and have the same value of 28. Do you agree? Explain or show your reasoning.
   2. Explain why .

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3. Problem 3

   ForLesson 19: Use Properties to Multiply Decimals

   Student Task Statement

   1. Explain why each expression has the same value as .

   2. Find the value of using one of the expressions or your own strategy.

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4. Problem 4

   ForLesson 20: Products in the Hundredths Place

   Student Task Statement

   Shade the diagram to represent .

   What is the value of ?

   

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5. Problem 5

   ForLesson 21: Multiply More Decimals

   Student Task Statement

   1. Explain or show why .

   2. Use this strategy to calculate .

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6. Problem 6

   Exploration

   Student Task Statement

   Diego finds the value of . He says, "I know , so I just find and then divide by 100."

   1. Explain or show why Diego's method works.

   2. Use his method to find the value of .

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7. Problem 7

   Exploration

   Student Task Statement

   1. Han says the diagram shows . Label the diagram to show Han's reasoning.

      

   2. Mai says it shows . Label the diagram to show Mai's reasoning.

      

   3. What other products can the diagram represent? Explain or show your reasoning.

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