Your question is susceptible to differing interpretations. 8 and 58/9ths is not properly expressed at all, but is simplified to 14 and 4/9ths. On the other hand 66/9ths (which is 8 and 58) is simplified to 7 and 1/3rd.
6-9ths euqal = -3
87 9ths in a mixed number = 92/3
3/9 of 1.80 is 0.6
17/51 or 111/333
79/9ths
5/9ths of 3 = 5/9 * 3 = 0.555555556 * 3 = 1.666666667
36 is 4 9ths of 81.
28 and 4/9ths
3 and 4/9ths
32/9
6 9ths = 6/9 in fraction