Pre-Algebra Demystified

(Marvins-Underground-K-12) #1
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

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