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common denominator2

Arithmetic Study Guide for the
ACCUPLACER Assessment Test

DECIMALS

Adding and Subtraction Decimals

Add: 28.5 + 44.47 + 3075.6   Subtract: 380.53 - 75
Step 1: Line up the decimal points .

Step 2: Then add or subtract

Multiplying Decimals

Multiply 1.89 x 5.03 = ___

Step 1: Multiply the decimals as you would do with whole
 

Step 2: T hen count the number of spaces of each factor being multiplied. Decimal
places are the number of spaces to the right of the decimal point, There is 2 in
the top factor and two in the bottom factor, so the decimal is placed 4 spaces
from the right.

Step 3: Show the total number of places in your answer.

Dividing a Decimal by a Whole Number

Example:   Place the decimal point directly above its position in the problem.
Then divide the same way as you divide whole numbers.

Dividing a Decimal by a Decimal Number

Example:   Move the decimal point of the divisor ( outside the bracket ) as far right as you cango. Then move the decimal point in the dividend (inside the bracket) the samenumber of places as the divisor.

Place the decimal point directly above its position in the problem. Then divide the same way as divide whole numbers.

 

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