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.
17/80 is in its simplest form.
80/340 = 4/17
34/80 = 17/40
17/80
17/20
10/17
21.25% = 21.25/100 = 2125/10000 = 17/80
68/80 = 34/40 = 17/20 <-----------------------------
It is: 68/80 = 17/20 in its simplest form = 0.85 as a decimal
The simplest form of the fraction 78/102 is 13/17.
21/80 is already in its simplest form
21.25% = 2125/10000 = 17/80