While 17 is a Prime number, it will go into 51 three times exactly.
Thus if you divide both top and bottom of 17/51 by 17, you get
1/3 which is the simplest form.
1/3 is the simplest form of 17/51
17/19 is the simplest form of 51 over 57.
37/51 is in its simplest form.
3/51 is 1/17 in simplest form.
51 over 17 = 3/1 or 3
12/51 = 4/17
51/90 = 17/30
9 over 51 can be simplified as 3 over 17.
51/60 = 17/20
1 over 3
17/24
7/17