91:9 (or 9:91)
91/100
91% = 91/100
11/13
182/10 = 91/5
21/91 = 3/13
91:100
91/200 is in its simplest form.
91/24 is in its simplest form.
91/36 is in its simplest form.
4/91 is already in its simplest form
41 over 91 in simplest form is unchanged.
182/100 = 91/50 or 1 and 41/50