89/13 is improper. Therefore, you can reduce it to 6 11/13 (6 and 11 over 13). It cannot be simplified past that.
Yes. 89/13 = 617/20
It is already simplified to 89/169
89/100 is as simple as it can be.
It can not be simplified further.
11 over 89 cannot be simplified, because 11 and 89 are prime numbers
13/9 cannot be simplified.
-13/72 cannot be simplified.
Yes, it is simplified.
It is already simplified.
13/20 cannot be simplified further.
13/33 can't be simplified any further
No. 13 is a prime number and cannot be simplified.