Least Common Multiple (LCM) of 15 and 21

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To get the Least Common Multiple (LCM) of 15 and 21 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:

15:35
21:37
LCM:357

The Least Common Multiple (LCM) is: 3 x 5 x 7 = 105

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