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17 January, 14:10

Find the least common multiple of 7, 18, 21

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  1. 17 January, 14:16
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    126

    7: 7, 14,21,28,34,41,49,56, 63,70,77,84, 91, 98, 105, 112, 119, 126

    18: 18,36, 54, 72, 90, 108, 126

    21: 21, 42, 63, 84, 105, 126

    you can see that when you list out the multiples the least common multiple is 126 because it's what they all have in common
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