You may use the models shown below to help you find the sum.

0.42

0.54

1.08

1.80

2

1 pt

Find the sum.

6.32 + 9.5

Explain how you got your answer, or use a model or another strategy to show how you got your answer:

3

1 pt

Find the difference.

10.73 - 1.8

Explain how you got your answer, or use a model or another strategy to show how you got your answer:

4

1 pt

Jenna’s backpack weighed 12.09 pounds. Kara’s backpack weighed 15.3 pounds. How much heavier was Kara’s backpack?

Use what you know about decimals to explain how you found your answer.

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