Definition of Multiplication. The repetitive addition of a single number or adding a number multiple times. This means it\'s like adding a lot of times.. How Multiplication Works. Above are 12 groups of 20The total number of red rectangles is 240 (Count them if you don\'t believe me.)So, 20 added together 12 times is 240Which, Properly written is: 12 x 20 = 240.
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