Multiplying Decimals
To multiply decimal numbers, perform multiplication as you would with whole numbers. Then count the number of digits that follow the decimal point or points in the factors. This total will be the number of digits that follow the decimal point in the product.
Examples
12. × 7. The product will have four digits following the decimal point.
3499. × 19. The product will have five digits following the decimal point.
14 × 3. The product will have two digits following the decimal point. (The second digit behind the decimal point is 0: 49.70 = 49.7.)
Multiplying Decimal Numbers Practice Problems
Practice
1. 3.2 × 1.6 =
2. 4.11 × 2.84 =
3. 8 × 2.5 =
4. 0.153 × 6.8 =
5. 0.0351 × 5.6 =
Solutions
1. 3.2 × 1.6 = 5.12
2. 4.11 × 2.84 = 11.6724
3. 8 × 2.5 = 20.0 = 20
4. 0.153 × 6.8 = 1.0404
5. 0.0351 × 5.6 = 0.19656
Practice problems for this concept can be found at: Algebra Decimals Practice Test.
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