When we are solving this type of Questions which includes two operations, first we have to go for division then after addition.
6 + 5/9 = 59/9 or 65/9
15/18 + 10/18 = 25/18 or 1 and 7/18
13/45
(8/9) + (5/6)
6
5/6+1/9=51/54
5/9 + 1/6 is 13/18
8/9+5/6 is 31/18.
7/9+5/6 = 29/18
The sum of 5/6 and 4/9 is 1 5/18
6/5 + 2/-9 = 44/45
1.388888888888889
4/9
9/10
5/9 + 2/3 = 5/9 +6/9 = 11/9 = 1 2/9