The first five positive integer multiples of 18 are as follows:
1 x 18 = 18
2 x 18 = 36
3 x 18 = 54
4 x 18 = 72
5 x 18 = 90
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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.
6, 12, 18, 24, 30
The first five multiples of 6 are 6, 12, 18, 24 and 30. For them to be common, they need to be compared to another set of multiples.
5: 5, 10, 15 9: 9, 18, 27 If you are looking for the lowest common multiple between 5 and 9 it would be 45. By the way multiples are just counting by the number itself. e.g. 5, 10, 15, 20, 25, 30, 35 (just count by fives or if the number was anything else count by that number)
The first 3 multiples of 6 are: 6, 12, and 18.