They are both perfect squares less than 100.
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The LCM is: 324
Assuming that least common refers to the least common multiple, LCM(27, 81) = 81
The Least Common Multiple of 9 and 81 is 81.
1, 2, 4, 8, 16, 32, 64 1, 3, 9, 27, 81
The GCF of 53 and 81 is 1.