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).
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The first 5 multiples of 9 are 9, 18, 27, 36, and 45. For them to be common, they need to be compared to another set of multiples.
All multiples of 36 are multiples of 18.
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, . . .
The common multiples of 6 and 9 are the infinite set of multiples of their LCM, which is 18. So the common multiples of 6 and 9 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, and so on.
For 9: 9, 18, 27, 36 and so on. For 12: 12, 24, 36, 48 and so on. For 18: 18, 36, 54, 72 and so on. Common multiples include, 36, 72, 108, 144 and so on.