Any multiple of 18.
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90, 180, 270
The LCM is: 18
1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.
Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.