A common multiple of 9, 45 and 81 is a number of the form 405*k where k is any integer.
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The Least Common Multiple of 9 and 81 is 81.
Since 45 is a multiple of 9, it is automatically the LCM.
36 and 45 or 9 and any multiple of 9
The GCF is 9.
GCF (45, 81, 90) = 9