The least common multiple is the smallest number that is multiple of two or more numbers.
3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63
7: 7, 14, 21, 28, 35, 42, 49, 56, 63
9: 9, 18, 27, 36, 45, 54, 63
The LCM of 3,7 and 9 is 63.
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