11/13
77/91 = 11/13
91:9 (or 9:91)
182/10 = 91/5
21/91 = 3/13
91/200 is in its simplest form.
91/36 is in its simplest form.
91/24 is in its simplest form.
4/91 is already in its simplest form
41 over 91 in simplest form is unchanged.
Since there is a common factor of 7, this becomes 11 over 13 (that is, 11/13)
91 and a half as a fraction in simplest form is 183/2
65 over 91 in simplest form is 5/7