7 and 3
1 and 10 2 and 5
10 and 5.
98
11
21 + 140 + 700 = 861 861 x 10 = 8610 8610 + 861 = 9471 = 77 x 123
-20 and -20 10 and -50 40 and -80
127
861 is divisible evenly by 3 but none of the others
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.
30 and -40 20 and -30 10 and -20 5 and -15 2 and -12 -5 and -5
4 & 6
40 and 10