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.
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Any multiple of 9.
The first 5 common multiples are the first 5 multiples of their lowest common multiple (LCM) LCM(9, 10) = 90 → first 5 common multiples are 90, 180, 270, 360, 450.
8 and 9 are corpime, so their first common multiple is their product. The next common multiples are simply the multiples of that first multiple.The first three common multiples are therefore 72, 144 and 216.
The common multiples of any two (or more) numbers are multiples of their lowest common multiple (lcm). lcm(9, 11) = 99 → first five common multiples are: 99, 198, 297, 396, 495
The first 3 multiples of 9 are: 9, 18, and 27.The first 3 multiples of 12 are: 12, 24, and 36.