Nine over 21 in its simplest form is 3/7
21/7 in simplest form is 3/1 = 3
The simplest form of 21/75 is 7/25
12/21 = 4/7 in its simplest form.
18/21 in simplest form is 6/7.
21/36 in simplest form is 7/12
21/57 in simplest form is 7/19.
21/16 is in its simplest form.
21 over 49 in its simplest form is 3/7
7
this the simplest form
2 7/21