324
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The least common multiple of 81 and 108 is 324.
18 = 2 x 32 81 = 34 108 = 22 x 33 LCM = 22 x 34 = 4 x 81 = 324
The LCM is 567.
The common factors of 81 and 108 are: 1, 3, 9, and 27
Since 54 is a multiple of 27, it is automatically the LCM.