No. The hcf of 51 and 64 is 1.
Yes
51/100 cannot be simplified further.
17/18
51/75 = 17/25
75 over 100 equals 3 over 4.
In lowest terms, 51/75 is 17/25. As a decimal, it is 0.68.
45/75 = 3/5
2/5
2/3
51 over 100; 51/100 its prime so you can't simplify it.
5/51 if you simplify it