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Multiplying and Dividing Fractions

Multiplying Fractions

Three simple steps are required to multiply two fractions: Examples of multiplying fractions:

In the first example you can see that we multiply the numerators 2 x 6 to get the numerator for the answer, 12. We also multiply the denominators 5 x 7 to get the denominator for the answer, 35.

In the second example we use the same method. In this problem the answer we get is 2/12 which can be further reduced to 1/6.

Multiplying Different Types of Fractions

The examples above multiplied proper fractions. The same process is used to multiply improper fractions and mixed numbers. There are a couple of things to watch out for with these other types of fractions.

Improper fractions - With improper fractions (where the numerator is greater than the denominator) you may need to change the answer into a mixed number. For example, if the answer you get is 17/4, your teacher may want you to change this to the mixed number 4 .

Mixed numbers - Mixed numbers are numbers that have a whole number and a fraction, like 2 . When multiplying mixed numbers you need to change the mixed number into an improper fraction before you multiply. For example, if the number is 2 1/3, you will need to change this to 7/3 before you multiply.

You may also need to change the answer back to a mixed number when you are done multiplying.


In this example we had to change 1 to the fraction 7/4 and 2 to the fraction 5/2. We also had to convert the multiplied answer to a mixed number at the end.

Dividing Fractions

Dividing fractions is very similar to multiplying fractions, you even use multiplication. The one change is that you have to take the reciprocal of the divisor. Then you proceed with the problem just as if you were multiplying. Taking the reciprocal: To get the reciprocal, invert the fraction. This is the same as taking 1 divided by the fraction. For example, if the fraction is 2/3 then the reciprocal is 3/2.


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