To find the LCM of 2+ multiples, you have to write the multiples of it out first.
So, in this case, it's 12 and 9.
12: 12,24,36,48,etc..
9: 9,18,27,36, etc...
so the LCM is 36.
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The least common multiple of 10 , 12 , 9 = 180
A common multiple is 9*8*10*12 = 8640, though that is not the least common multiple.
The LCM is 900.
The least common multiple of 9, 18, and 27 is 54.
The LCM or least common multiple of 9, 12, 4, and 18 is 36.