*The answer is 8* because, If you divide 56/7 you get 8. If you have any more question like that always do the inverse operation. Example: 6 x ___= 42 the inverse or opposite operation is division because division is the opposite of multiplication like adding is to subtracting. So we would do 42/6 (Inverse operation) and we get 7. So, the answer to the question is 6 x *7* = 42. Hope this trick will help! (Subtraction & Division don't work the same! Only, Addition and Multiplication does!)
~ Helping Hand.