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first, list several multiples of each number.

4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 46, 50...

9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90....

12: 12, 24, 36, 48, 60, 72...

look for the lowest number that occurs in each list.

36 is in all 3 lists so that means that the lowest (least) common multiple, also known as LCM, is 36.

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15y ago

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