Least Common Multiple (LCM) of 20 and 42

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To get the Least Common Multiple (LCM) of 20 and 42 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:

20:225
42:237
LCM:22357

The Least Common Multiple (LCM) is: 2 x 2 x 3 x 5 x 7 = 420

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