That is it - there is no number that goes into
both 13 and 9
Especially as 13 is a Prime number anyway.
9/13
9/13 x 9/13 is 81/169.
18/26 = 9/13
-81/117 = -9/13
9/13
9/13
1/13
9/13
9/13
9/13
It is: 9/13 divided by 12/13 = 3/4 in its simplest form
It is: 9/117 = 1/13