It is already in simplest form.
4/11
76 over 135 is already in simplest form.
You can't simplify it any more. Nothing goes into both 76 and 11 equally.
6 over 19 is the simplest form
76 of 45 is already in simplest form because 45 cant go into 76
40/76
It is: 76/95 = 4/5
76/80 = 19/20
56/76 = 14/19
28/76 = 7/19
76/8 = 19/2
38 over 45