To simplify 9/56 is easy. You need to find a common factor. For this, the easiest method is to jot them down.
1,3,9
1,2,4,6,7,8,9,14,23,56
As you can see, 9 is the only large common factor. Do if you divide 9 by 9 you get 1 and 56 by 9 you get 6. The answer therefore would be 1/6.