One-third plus three-ninths is 2/3.7/9
2/3
10 and 2/3.
2
2/9
You can restate "one third" as "three ninths"; then subtracting three ninths from five ninths leaves two ninths: 5/9 - 3/9 = 2/9
6 ninths. That is two thirds: 2/3.
2/27
2/9
Eight ninths
It is: 15/9 or1 and 2/3
1 third = 3 ninths, 3 ninths - 2 ninths = 1 ninth.