What is 1/7 - 3/7?

Here's how to subtract 3/7 from 1/7:

Step 1

Since our denominators match, we can subtract the numerators.

1 − 3 = -2

So the answer is:

Step 2

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...

Nope! So now we try the next greatest prime number, 3...

No good. 3 is larger than -2. So we're done reducing.