It's not entirely clear from the wording of your question what it is you want to know. Seven is a one-digit number. The sum of its digits is 7. Seven has two factors: 1 and 7. That sum is 8.
13 and 1/12
The sum of 1/3 and 7/12 is 11/12
Assume we want to determine the result in word form for "one and seven". It's obvious. "One" is 1 and "seven" is 7! Then, 1 + 7 = 8. So in word form, the sum of these two values is "eight".
7, 13 and 17
seven eighths
8 and 3/8
7/16 3/8 = 6/16 6/16 + 1/16 = 7/16
The sum is 8 1/2 or 8.5
3/16
There are eight eighths in a whole. We have four whole units, so the first sum is: 8x4=32 In this case, we have 7 additional eighths, so add them on, and the answer is: 32+7=39
o.875
The estimated sum is 11. The actual sum is 10 and 19/24
six eighths
Assuming the question is about four eighths and not four eight, 9/16 + 4/8 = 9/16 + 8/16 = 17/16.
Estimated 8 + 3 = 11 Actual: 10 and 19/24
The sum of 5/8 and 1/3 is 23/24