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29 October, 23:24

What is the least common multiple of 20 and 42

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  1. 29 October, 23:45
    0
    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: 2 2 5

    42: 2 3 7

    LCM: 2 2 3 5 7

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

    Sorry the chart looks messy - _-
  2. 29 October, 23:46
    0
    The answer is 2, because 42/2 is 21, and 20/2 = 10
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