Chapter 4 Test - Multiply Decimals

Ganesh is making a scale model of the Space Needle in Seattle, Washington. The space needle is 605 feet tall. If the model is 1/100 the actual size of the Space Needle, how tall is the model?

(a)  

For numbers 2a–2d, choose Yes or No to indicate whether the product is correct.

• 2a. 0.48 × 10 = 4.8 Yes No

• 2b. 0.76 × 10 = 76 Yes No

• 2c. 0.01 × 100 = 0.1 Yes No

• 2d. 0.50 × 1,000 = 500 Yes No

Madison is in charge of buying the hamburger meat for her company’s annual picnic. She needs to buy enough meat to make 1,000 hamburgers. Each hamburger will weigh 0.25 pound. How many pounds of hamburger meat does Madison need to buy? Explain how to find the answer.

Kara is shading this model to show 0.09 × 4. Shade the correct amount of boxes that will show the product. Kara should shade ____________ groups of ____________ small squares or ____________ small squares.

(a)  

Rhianna is making a shelf to store her collection of rocks and shells. She is using 5 pieces of wood that are each 3.25 feet long. How much wood will Rhianna use to make the shelf?

(a)  

Which problems will have two decimal places in the product? Mark all that apply.

• 3 × 0.65

• 4.8 × 2

• 8.1 × 10

• 6.1 × 7.3

• 7.22 × 10⁰

Mari and Rob are making a poster for the science fair. They need to figure out how much a rock that weighs 7 pounds on Earth would weigh on Mars. They know that they can multiply the amount the rock weighs on Earth by 0.38 to find its weight on Mars. Circle the partial products Mari and Rob would need to add to find the product of 7 and 0.38. Mark all that apply.

• 0.7

• 0.56

• 2.66

• 2.1

• 0.38

Michael exchanged 1,000 U.S. dollars for the Croatian currency, which is called the Kuna. The exchange rate was 5.81 Kuna to $1.

Part A

How many Croatian Kuna did Michael get? Explain how you know.

Part B

Michael spent 4,976 Kuna on his trip. He exchanged the Kuna he had left for U.S. dollars. The exchange rate was 1 Kuna to $0.17. How many U.S. dollars did Michael get? Support your answer using specific information from the problem.

(a)  

Paul works at a local grocery store. He worked 15 hours this week. Last week, he worked 2.5 times as many hours as he worked this week. How many hours did Paul work last week? Show your work.

(a)  

Jeremiah always rides his bike to and from work. The total length of a trip to and from work is 14.6 kilometers. Last month, Jeremiah worked 18 days. How many kilometers did he ride his bike to and from work last month? Show your work.

(a)