Eight over twenty one is in simplest form.
6/16
12 over 39 = 2 over 3
10/15=2/3
2/5
It is: 28/48 = 7/12 in its simplest form
8/27
4/3 or 1 and 1/3
7/8
4/11
17/28 (read like "seventeen over twenty-eight" or "seventeen twenty-eighths"
it's in the simplest form...