There is no greatest form. 5/27 is in its simplest form.
135/5 = 27
15/27 = 5/9
27/45 = 3/5
5/27 cannot be simplified any further.
5/9
3/5
1.6667
27/45 = 9/15 = 3/5
2 + 17/5 = 27/5
45 / 27 = 5 / 3 = one and two thirds
27/5 is already in its simplest form but as a mixed number it is: 5 amd 2/5