6/1
6 is a whole number. you can't make a whole number into fraction
13/6
2 5/6 or 17/6
6/3
1/6 is as simple as it can get
Assuming you mean 6/8: Two ways to get a greater fraction are to make the numerator greater; or to make the denominator smaller.
30/100 or 6/20
17 and 6/10
2/3
You can do this in two steps. First you convert it to an improper fraction the usual way. Then you transform it to an equivalent fraction, with a denominator 6.
6/16
0.06 can be written as 6/100,3/50