21/4
21/4 is in its simplest form.
4/21 is in its simplest form.
12/21 = 4/7 in its simplest form.
4/21 is in its simplest form.
21/4
21/28 = 3/4
21/4
4/21
4 of 21
2/21
4√21
The greatest common factor of 16 and 21 is 1. Therefore, 16/21 cannot be reduced and is already in its simplest form.