It is: 16 21
65/84 cannot be simplified.
If you mean 33/84 then it is 11/28 simplified
56-64 simplified = -8
80 over 84 simplified = 20/21
64/125 cannot be simplified.
64 divided into 84 = 0.7619047619047619
63/64 cannot be simplified further.
164
64
64 over 96 simplified = 2/3
2 and 11/84.
The GCF is 4.