Let's try one:

Let's reduce

What goes into the numerator AND the denominator?

3 goes in... So, let's divide it out!

Hey, now it's easy! Do you see that 9 goes in?

so

The best way to do it is to get the GCF (greatest common factor) of 27 and 108...

The GCF is 27.

If we divide by the GCF, we can do it in one shot:

But, you know what?

If you can't find the GCF, just start dividing out stuff you see like we did at first.