53/45 cannot be simplified further.
No
It is: 45/1000 = 9/200 simplified
45/63 is 5/7 simplified
16/45 cannot be simplified.
-53/20 = -213/20
No, because 53 is a prime number.
53/56 is in its simplest form.
It is: 45/171 = 5/19 simplified
It is: 1281/45 = 427/15 simplified
Yes, to: 1 36/53
It is 2/9 simplified
It is: 3/5 simplified