## Lesson: Multiplying and Dividing Decimals

Developing the Concept

Many problem-solving situations involve operations with decimals. Now that your students have learned to multiply decimals, it's time to show them how to divide a decimal by a decimal.

**Prerequisite Skills and Concepts:** Students need to be familiar with division of whole numbers and division by a decimal.

Present this problem to the class.

Aaron ties trout flies for the local fly-fishing shop. He earns $0.65 for each fly he ties. If he earned $9.75 before his lunch break, how many trout flies did he tie?

**Wrap-Up and Assessment Hints**

Provide the following practice exercises to check students' mastery of dividing a decimal by a decimal. Remind students that when multiplying by (positive) powers of ten, we move the decimal to the right as many places as designated by the exponent (or the number of zeros in the standard form).

- 4.85 ÷ 0.5 = (9.7)
- 0.938 ÷ 0.7 = (1.34)
- 0.315 ÷ 0.35 = (0.9)
- 0.184 ÷ 0.8 = (0.23)
- 0.824 ÷ 0.24 = (3.43)