as 17/80, that is as simple as it gets. Unless 0.21 is more simple or 21% as another suggestion
17/80 is in its simplest form.
80/340 = 4/17
34/80 = 17/40
68/80 = 34/40 = 17/20 <-----------------------------
17/20
10/17
21/80 is already in its simplest form
17 is prime and can't be reduced. If that's 80/17, it is in its simplest form. You could also call it 4 and 12/17.
Cancelled down to a fraction in its lowest terms, 80/96 is equal to 5/6, or five-sixths.
9/80 is in its simplest form.
80 over 99 is already in lowest terms.
27 over 80!