The traditional names for the parts of the formula
c − b = a
are minuend (c) − subtrahend (b) = difference (a). The words "minuend" and "subtrahend" are not used much now. The answer is still called the difference.
The related link that I posted sums it up pretty good, but here it is: Multiplicand X Multiplier = Product. From the Commutative Property of multiplication, you can take A X B and B X A and get the...