The multiples of 18 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, . . .
The multiples of 27 are 27, 54, 81, 108, 135, 162, 189, 216, 243, 270, . . .
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9, 18, 27
The common multiples of 18 and 27 are 54, 108, 162, 216, and so on. Each is a multiple of 54, which is the least common multiple of 18 and 27. There is an infinite number of common multiples for 18 and 27. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
7 (has no multiples)
The two-digit multiples of nine are 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
9, 18, 27, 36, 45