lets say that you're doing a division problem that looks just like a multiplication problem. lets say its 10 divided by 5 so 2x5 equals 10 so the missing number in the problem is 2 MORE TO COME

The Abelian or commutative property of the multiplication of numbers. It is important that both "multiplication" and "numbers" feature in the answer. Because, it is applicable to multiplication but not, for example, for division. It is applicable for the multiplication on numbers but not matrices.