Unit 8 Contents

18. Use rectangles to solve the following problems.
1. 4 2.8 =
2. 6 3.4 =
3. 3 3.2 =
4. 5 4.1 =

Multiply a Decimal by a Decimal

For Questions 19–22, use a calculator to solve the problems. Look for patterns.

1. 0.2 3 =
2. 0.2 0.3 =
3. 0.2 0.03 =
4. 0.2 0.003 =
5. 0.2 0.0003 =
1. 0.3 3 =
2. 0.3 0.3 =
3. 0.3 0.03 =
4. 0.3 0.003 =
5. 0.3 0.0003 =

1. 6.5 1 =
2. 6.5 0.1 =
3. 6.5 0.01 =
4. 6.5 0.001 =
5. 6.5 0.0001 =

23. Do you see a pattern in the problems that could help you place the decimal point? How is the sum of the number of digits after the decimal points in the factors related to the number of digits after the decimal point in the product?