 # What is 7/9 - 6/8? Here's how to subtract 6/8 from 7/9:

 7 9
 6 8

## Step 1

We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.

So we multiply 7 by 8, and get 56.

Then we multiply 6 by 9, and get 54.

Next we give both terms new denominators -- 9 × 8 = 72.

So now our fractions look like this:

 56 72
 54 72

## Step 2

Since our denominators match, we can subtract the numerators.

56 − 54 = 2

 2 72

## Step 3

Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction?

To find out, we try dividing it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

 2 72
÷ 2 =
 1 36

Let's try dividing by 2 again...

No good. 2 is larger than 1. So we're done reducing.

There you have it! The final answer is:
 7 9
 6 8
=
 1 36