 # What is 3/7 - 4/10? Here's how to subtract 4/10 from 3/7:

 3 7
 4 10

## 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 3 by 10, and get 30.

Then we multiply 4 by 7, and get 28.

Next we give both terms new denominators -- 7 × 10 = 70.

So now our fractions look like this:

 30 70
 28 70

## Step 2

Since our denominators match, we can subtract the numerators.

30 − 28 = 2

So the answer is:

 2 70

## 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 70
÷ 2 =
 1 35

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:
 3 7
 4 10
=
 1 35