Least Common Multiple (LCM) of 640 and 15

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To get the Least Common Multiple (LCM) of 640 and 15 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:

640:   2222222 5
15:          35
LCM:   222222235

The Least Common Multiple (LCM) is:   2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5 = 1920

 

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