That's the lowest it can be reduced already. 6/13.
6 over 13
6/26 = 3/13
48/104 = 6/13
13/21 can't be reduced.
2/13 is in reduced form
6 over 8 reduced = 3/4
6 over 18 is reduced to 1/3
The fraction 13/35 cannot be reduced any more.
The fraction 13/40 cannot be reduced any more.
The fraction 22/13 cannot be reduced any more.
No.