the sum of 1 plus 9 is 10 because 1+9
9
8/9
The sum of -9 and -1 is -10.
The sum of 4/9 and 1/9 is 5/9.
The sum of 1/9 and 2/9 = 1/3
The sum of 7/9 and 1/3 is 1 1/9
-20
The sum of 4/9 and 1/9 is 5/9.
The sum of 7/9 and 1/2 is 1 5/18
The sum of 3/4 and 1/9 is 31/36
The sum of 1/6 and 4/9 is 11/18.
The sum of 1/3 and 5/9 is 8/9.