11
55
The ten numbers from 1 to 10.
The sum of the numbers 1 through 10 is 55.
-9
11
55
11
It is 10*(10+1)/2 = 55
The ten numbers from 1 to 10.
The sum of the numbers 1 through 10 is 55.
The sum of the first 10 counting numbers (1-10) is 51.
-9
Assuming the question refers to INTEGERS and not numbers, the answer is 55.
They add up to 55
1, 2, 5, 10, 11, 22, 55, 110
1, 2, 5, 10, 11, 22, 55, 110 | 1 x 110, 2 x 55, 5 x 22, 10 x 11.