By comparing it with another number.
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You need at least two numbers to find an LCM. If that's 5 and 27, the LCM is 135.
Since 189 is a multiple of both 9 and 27, it is automatically the LCM.
The LCM of 9, 8 and 27 is 216
LCM(27, 24) = 216.
LCM(3, 27, 35) = 945