What is 1/5 - 2/8?

Here's how to subtract 2/8 from 1/5:

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 1 by 8, and get 8.

Then we multiply 2 by 5, and get 10.

Next we give both terms new denominators -- 5 × 8 = 40.

So now our fractions look like this:

Step 2

Since our denominators match, we can subtract the numerators.

8 − 10 = -2

So the answer is:

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:

Let's try dividing by 2 again...

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