5/9+2/9 = 7/9.

5/9 + 2/9 = (?)

5/9 + 2/9 = (5 + 2)/9

= 7/9

5/9 + 2/9 = 7/9

5/9 is a fraction as an addend,

2/9 is a fraction as an addend,

7/9 is the sum of 5/9 and 2/9.

5/9 + 2/9 = 7/9

7/9 = 0.7778

5/9+2/9 as a decimal is 0.7778

0.7778 is the sum of 5/9 and 2/9.