The first five multiples of 6 are 6, 12, 18, 24 and 30. For them to be common, they need to be compared to another set of multiples.
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The common multiples of 6 and 5 are 30, 60, 90, 120, 150, 180, and so on.
30, 60 and 90.
The first 5 multiples of 3 are as follows: 3, 6, 9, 12, 15
90
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.