Subtraction of Decimal Numbers

Unlike addition, the order of subtraction DOES make a difference. For instance, 3.9 - 0.9 is NOT the same as 0.9 - 3.9. Subtraction is the opposite of addition, so you can check your answers to subtraction problems using addition. Look at the example below:

0.9 - 0.2 = 0.7

Checking by addition:

0.7 + 0.2 = 0.9

Tip: You may prefer to use a calculator and/or paper & pencil to assist you. There is an on-screen calculator available from Window Accessories.

Start > Programs > Accessories > Calculator.

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