If the missing number in the second one is larger than the missing number in the first one, then the big one minus the small one will equal the missing number in the answer.
e.g 24
2 x 6
8 = 1
645
6
Therefore 8 - 2 = 6
Only applies where the number in the answer is the same.
Can I leave the class now miss, as I have to go to the toilet?
