Multiplies to - 1120 adds to 3

With these, always write out the multiples first.

Start like this:

(assume one of the factors is negative)

1 and 1120

2 and 560

4 and 280

5 and 224

7 and 160

8 and 140

10 and 112

14 and 80

16 and 70

20 and 56

28 and 40

32 and 35

from those, the obvious choice is the one with a difference of three. In this case, 32 and 35, because - 32 + 35 equals 3.