Simplify it by dividing both the numerator and denominator by the same amount. They both must have a result.
For example, we have 8/16.
We can divide it by 2 which gives us 4/8, but it can be simplified more.
We can divide it by 4 this time, which gives us 2/4, but it can still be smaller.
We can divide it by 8 this time, which gives is 1/2. This is the farthest simplification that you can get for 8/16.
Hope this helps