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3. multiplication-an arithmetic operation that is the inverse of division; the product of two numbers is computed; the multiplication of four by three gives twelve; four times three equals twelve. times. arithmetic operation-a mathematical operation involving numbers.
(December 2009) In mathematics, reduction refers to the rewriting of an expression into a simpler form. For example, the process of rewriting a fraction into one with the smallest whole-number denominator possible (while keeping the numerator an integer) is called reducing a fraction.