Question 837382
He made it much harder than it is.
We didn't even have to deal with the fractions at all.

+4 5/9
-3 ---
 1 5/9
Besides, he made a simple arithmetic error.

4 5/9 - 2 9/9
5+9=14 not 15
3 14/9 - 2 9/9 =1 5/9