100 has nine factors: 1, 2, 4, 5, 10, 20, 25, 50, 100.
The factors of 8 are 1, 2, 4, and 8. The factors that add up to 10 are 2 and 8.
268
715
It wasn't me, but I would have come up with 33. The four factors of 33 add up to 48.
When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.
-10 and +10.
The factors of 8 are 1, 2, 4, and 8. The factors that add up to 10 are 2 and 8.
1510
115
The factors that multiply to 120 and add up to -8 are -12 and 10. This is because when you multiply -12 and 10, you get -120, and when you add them together, you get -8. Thus, the pair of factors you are looking for is (-12, 10).
The 8 factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56. 2 and 8 add up to 10. Also, 1, 2, and 7 add up to 10.
170
268
-10 & -18
-589
-46
12610