Multiplying Fractions

There's two ways you can multiply fractions.  The first way I am going to show you is changing the fractions into decimals.  Say you had a problem that was 4/5 × 3/4=  .  The first thing you have to do is change the fractions to decimals.  So the fraction 4/5 will turn into .8 .  The fraction 3/4 would turn into .75.  Then you would line them up as if you were doing a regular multiplication problem.  The problem right now is .8 × .75.  when you figure this out on paper the answer would be .6.

Another way to do it is leave the fraction the way it is and multiply it side by side.  Say you had another problem that you didn't know how to turn it into a decimal.  Sort of like this one: 5/9 × 7/18 =   .  You first thing you have to do is set your fractions like this one:

5 × 18
9  20

Now, if the numbers diagonal from each other have a GCF then reduce them as low as they can go. So now the problem will look like this:

1 × 2
1   4

When you are multiplying now you multiply the top, then the bottom.  So the top, when it is all multiplied would be 2 and the bottom would be 4.  So the answer is 2/4 which can reduce to 1/2.   If you need extra practice go and take the test, see how you do.

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