No, it is in its simplest form.
20 over 53 can not be reduced because 53 is a prime number
53/99 is in its simplest form.
53/200
54/99 = 6/11
28 / 99 this is simplest, it cannot be reduced.
9/10
9/8
No, 99 and 200 don't have a common factor that they can both be divided by.
198/4 = 99/2
106/1000=53/500
Since the numbers 99 and 100 share no common factors other than 1, the fraction cannot be reduced any further.
46 + 53 = 99