No, it can be simplified further.
It is: 135/216 = 5/8 simplified
135/352 is already in its simplest form
It is: 36/42 = 6/7 simplified
100 over 36 simplified = 25/9
80 over 36 simplified: 20 over 9 and as a mixed number it's 2 2/9
It's 14 over 15.
14/36
It simplified to 5/9.
7/20
4 over 144 simplified = 1 over 36
No.