4/S is in its simplest form.
If you mean 2/4 then it is 1/2 in its simplest form
3/4
1/4 is in its simplest form.
4/5 is in its simplest form.
When you simplify in math, for example you could make 2/4 into 1/2 or 25/30 can be simplified into 5/6.
4/5 is the simplest form.
31/4 is in its simplest form.
4/5 is in its simplest form.
21/4 is in its simplest form.
225/4 is in its simplest form.
4/7 is in its simplest form.
4/15 is already in simplest form.4/15 is in its simplest form.