when you add secretly a one
23
it is 61 + 2 + 3 because if you add 61 + 5 it = 66 so if you split 5 into 2 and 3 it = 5 then add 61 to 5 and you get 66
31
Both numbers add up to 7
8 and 5
5 and 23
16
268
212
Factors of 250 that add up to 8 = 1 + 2 + 5
-13
The factor pairs of 12 are (12, 1) (6, 2) (4, 3) None of them add up to 5.