198, 396, 594, 792, 990 +198 . . .
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198, or 18 times 11. This is the smallest number that will have 11, 18 and 6 as factors. You don't have to worry much about 6, because any number with a factor of 18 will also have 6 as a factor.
1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 198.
It is 88.
Just the number 1.
The common multiples of 6 and 18 are 18, 36, 54, 72, 90, 108, and so on. There is an infinite number of common multiples for 6 and 18. 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).18