What is 7/11 - 9/11?

Here's how to subtract 9/11 from 7/11:

Step 1

Since our denominators match, we can subtract the numerators.

7 − 9 = -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.