Factor them.
3 x 3 = 9
3 x 11 = 33
Combine the factors, eliminating duplicates.
3 x 3 x 11 = 99, the LCM
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Least Common Multiple (LCM) for 27 33 is 297
You need at least two numbers to find an LCM.
For 8,439 and 6,693 the LCM is: 194,097
The LCM of 9, 27, and 72 is 216
You need at least two numbers to find an LCM. If that's 8 and 9, the LCM is 72