Pre-Algebra Demystified

ANSWERS

1. 5.232

2. 84.12

3. 0.2089

4. 4.35

5. 2.22065

Multiplication of Decimals

To multiply two decimals, multiply the two numbers, disregarding the decimal

points, and then count the total number of digits to the right of the decimal

points in the two numbers. Count the same number of places from the right in

the product and place the decimal point there. If there are fewer digits in the

product than places, prefix as many zeros as needed.

EXAMPLE

Multiply 32.10.62.

SOLUTION

32 : 1 Three decimal places are needed in the answer

 0 : 62

642

1926

19 : 902

EXAMPLE

Multiply 51.30.0006.

SOLUTION

51 : 3

 0 : 0006

0 : 03078

Since five places are needed in the answer, it is necessary to use one zero in

front of the product.

88 CHAPTER 5 Decimals