18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, . . .
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, . . .
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The first 3 multiples of 4 are: 4, 8, and 12.The first 3 multiples of 9 are: 9, 18, and 27.
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.
To find the common multiples of 3, 6, and 18, we need to list out the multiples of each number and find the numbers that appear in all three lists. The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, and so on. The multiples of 6 are 6, 12, 18, 24, 30, and so on. The multiples of 18 are 18, 36, 54, 72, and so on. The first three common multiples of 3, 6, and 18 are 18, 36, and 54.
36, 72, and 108.
3, 9, and 15. 6 and 18 are also multiples of 3, but are even.