To simplify fractions, look for common factors - factors that are shared by both numbers, in this case, 4 and 8. If you find one, divide both numbers by the common factor. Repeat, until there are no more common factors.
3/8 is in its simplest form.
4/5 is in its simplest form.
4/15 is already in simplest form.4/15 is in its simplest form.
4/5 is in its simplest form.
225/4 is in its simplest form.
3/8 is in its simplest form.
1/4 is in its simplest form.
4/5 is in its simplest form.
4/15 is already in simplest form.4/15 is in its simplest form.
4/5 is the simplest form.
21/4 is in its simplest form.
4/S is in its simplest form.
4/5 is in its simplest form.
225/4 is in its simplest form.
4/7 is in its simplest form.
31/4 is in its simplest form.
7/8