The common multiples of 9 and 10 are 90, 180, 270, 360, 450, 540, 630, 720, 810, 900, and so on.
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They are 90, 180, 270, 360, and 450.
Common multiples of 9 and 10 can be found by beginning with 90 (9 x 10) and counting in 90s after that, e.g. 180, 270, 360, 450, 540, 630, 720, 810, 900, etc.
The common multiples of 9 and 11 are 99, 198, 297 and so on.
The common multiples of 10 and 16 are 80, 160, 240 and so on.
The first 5 multiples of 9 are 9, 18, 27, 36, and 45. For them to be common, they need to be compared to another set of multiples.