What is 4/10 - 8/10?

Here's how to subtract 8/10 from 4/10:

Step 1

Since our denominators match, we can subtract the numerators.

4 − 8 = -4

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...

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

Let's try dividing by 2 again...

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

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