1/128
64 divided by 8 is 8, 8 divided by 4 is 2, 2 divided by 2 is 1, so you're answer is 1. (also, it is not one eight of 64, it is one eighTH of 64.)
56-64 simplified = -8
64/125 cannot be simplified.
6.25
5.3333
It is: 64/1 simplified
63/64 cannot be simplified further.
164
64 over 96 simplified = 2/3
32
64
825/64 cannot be simplified because the two numbers are co-prime.