81
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Factor each one and use each prime factor the most it was used in any of the numbers. 9=3x3 12=2x2x3 81=3x3x3x3 2x2x3x3x3x3=324
Since 45 is a multiple of 9, it is automatically the LCM.
Assuming that least common refers to the least common multiple, LCM(27, 81) = 81
The LCM of 27 and 63 is 189. The LCM of 81 and 441 is 3969. The LCM of all four is 3969.
The LCM of 2781 and 135 is 13,905. The LCM of 27, 81 and 135 is 405.