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18, 36, 54 and so on. It's all multiples of 18. Since 6 = 3 x 2 and 9 = 3 x 3, you have multiples of [3 x 3 x 2] which is 18.
A multiple is any number that goes into another number. A common multiples of 6 and 9 is the number 18.
Multiply 18 by a series of numbers. Therefore, multiples of 18 are, as follows: 18, 36, 54, 72, 90, 108...
18, 36, 54
9, 18, 27, 36, 45, 54.