4/91 is already in its simplest form
4/13
925/100 = 37/4 = 91/4 or 9.25
4 over 5 is in simplest form.
1/4 is in its simplest form.
4/19 is in its simplest form.
4 over 5 is in simplest form.
4/5 is in its simplest form.
4 over 70 in the simplest form is 2 over 35
3/4 * * * * * No, it is not, it is 91/100
4/9 is the simplest form.
4/25 is the simplest form.
4/7 is in its simplest form.