Yes.Yes.Yes.Yes.
8/81 can't be simplified any further.
81/100 cannot be simplified. the division = .81 though
15/81 can be simplified to 5/27
47/72 is already simplified
-13/72 cannot be simplified.
It is: 72/96 = 3/4 simplified
No
No.
55/72
72/81 = 8/9
No.