9, 18, 27, 36, 45, 54, 63, 72.
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The first two multiples are 9 and 8.
8,16,24,32
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.
You can't have common multiples if they have nothing to be in common with however the first 3 multiples of 9 are 9,18 and 27 Think of just your times tables when finding out Multiples to find the first 5 multiples just count by 9's until you have said 5 numbers and Bingo
9,18,27,36,45,54,63,72,81,90