LCM needs two or more numbers to solve. The LCM of one number is itself.
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The LCM is: 648
You need at least to numbers to find an LCM. If that's 81 and 24, the LCM is 648.
Least Common Multiple (LCM) for 512 648 is 41,472
The Least Common Multiple (LCM) of (180,300) is 900.
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