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The lowest common multiple is 18. The first four common multiples are thus the first four multiples of 18 and are: 18, 36, 54 and 72.
Multiples of 2 are 2, 4, 6, 8, 10, 12, 14, 16, 18, . . . Multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, . . .
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
36, 72, and 108.
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.