The difference of 42.17 and 15.85 is 26.32. Practice Problem Find the sum of 1.245 and 3.842.
Multiply Decimals To multiply decimals, multiply the numbers like any other number, ignoring the decimal point. Count the decimal places in each factor. The product will have the same number of decimal places as the sum of the decimal places in the factors.
Example Multiply 2.4 by 5.9.
Step 1 Multiply the factors like two whole numbers. 24 X 59 = 1416
Step 2 Find the sum of the number of decimal places in the factors. Each factor has one decimal place, for a sum of two decimal places.
Step 3 The product will have two decimal places. 14.16
The product of 2.4 and 5.9 is 14.16. Practice Problem Multiply 4.6 by 2.2.
Divide Decimals When dividing decimals, change the divisor to a whole number. To do this, multiply both the divisor and the dividend by the same power of ten. Then place the decimal point in the quotient directly above the decimal point in the dividend. Then divide as you do with whole numbers.
Example Divide 8.84 by 3.4.
Step 1 Multiply both factors by 10.
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