You divide by 11 and the answer is 1 over 10.
8/11 is as simplified as it can get.
11/39 is simplified.
11/104 cannot be simplified.
It is already simplified as 11/18
It is already simplified.
11/48 cannot be simplified further.
11/27 cannot be simplified further.
11/90. It cannot be further simplified.
1215 over 10 simplified = 243/2
11 over 12
11/18 cannot be simplified - 11 is a prime number !