6/9 is 2/3.
You could write it as a mixed number as 02/3 but I cannot see a single good reason for doing so.
6 and 4/9
9/6 = 11/2
2 and 6 over 9
It is 6 and 7/9
9/3
It is: 59/9 = 6 and 5/9
9 and 1/2
9 6/8
55/6 = 9 and 1/6
56 over 9 as a mixed number is 62/9
It is: 9 and 1/3
The mixed number for 28 over 9 is 31/9