They are: 5580, 11160, 16740 and 22320
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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.
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.
1, 660, 5580
First four common multiples of 2 and 3 is the same as the first four multiples of 6. 6, 12, 18, 24
All multiples of 36 are multiples of 18.