No, it can be simplified as: 119/56
28 over 56 simplified is 1/2.
53/45 cannot be simplified further.
39/56 cannot be simplified further.
No
no
no
-53/20 = -213/20
No, because 53 is a prime number.
No, it is already simplified.
13/56 + 40/56 = 53/56
No. The hcf of 19 and 56 is 1.