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:

21:37
4:22
LCM:2237

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

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