# Least Common Multiple (LCM) of 21 and 4

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To get the Least Common Multiple (LCM) of 21 and 4 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:

 21: 3 7 4: 2 2 LCM: 2 2 3 7

The Least Common Multiple (LCM) is: 2 x 2 x 3 x 7 = 84

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