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You need at least to numbers to find an LCM. If that's 81 and 24, the LCM is 648.
GCF (45, 81, 90) = 9
The GCF is 9.
810
1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.