This next method is probably beyond the pre-algebra level.  It's really not that bad, but it will seem a bit creepy at first.  I think it's just the name!

The Euclidean Algorithm:

An algorithm is just a list of steps to work through -- like a process where you do the same thing all the time.

I need to show it to you with letters first:

If you want to find

, you start with

In English (haha), you put b into a as many times as it will go (q) and, then, get the remainder.

Here it is with numbers:

Find