By making of table of their values, and when you find a multiple that matches, that's the LCM. The answer is 24
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LCM of 8, 5 and 12 is 120...
LCM of 8 and 9 and 12 is 72.
The LCM of 8, 12, and 24 is: 24
LCM(8, 28, 12) = 168.
If you mean: 8, 20 and 12 then the LCM is 120