Practice: Multiplying Decimals

Part A: Decimal x Whole Number

Directions: Multiply. Show your work. Remember to count decimal places!

1. 4.3 x 5

2. 6.25 x 4

3. 0.8 x 7

4. 12.5 x 8

Part B: Decimal x Decimal

Directions: Multiply. Count decimal places in BOTH factors to place the decimal in your answer.

5. 2.4 x 3.5

6. 1.8 x 4.2

7. 0.6 x 0.5

8. 3.25 x 0.4

Part C: Mixed Practice

Directions: Multiply. Pay attention to the number of decimal places in each factor!

9. 5.6 x 3

10. 0.9 x 0.8

11. 4.5 x 2.2

Part D: Word Problems

Directions: Read each problem carefully. Show your work and write your answer with correct units.

12. Apples cost $1.75 per pound. Mrs. Chen buys 6 pounds of apples. How much does she spend?

Answer: $____________

13. A rectangle has a length of 4.5 meters and a width of 2.8 meters. What is the area of the rectangle? (Area = length x width)

Answer: ____________ square meters

14. Maya walks 0.75 miles each day. How many miles will she walk in 5 days?

Answer: ____________ miles

Challenge: Think About It!

15. Carlos says that 0.5 x 0.5 = 0.25. Maria says the answer should be 2.5 because the product should be bigger than the factors. Who is correct? Explain your reasoning.

16. Without calculating, determine which product is greater: 4.5 x 0.9 or 4.5 x 1.1. Explain how you know.