21/36 in simplest form is 7/12
divide top and bottom by 3....7/12
7/12
7/36
21/36 - 20/36 = 1/36
3
49/36 is in its simplest form.
36/55 is in its simplest form.
31/36 is in its simplest form.
91/36 is in its simplest form.
7/36 is in its simplest form.
The simplest form of 36 over 1000 is 9/250