18, 36, 54, 72, 90.
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The first 5 multiples of 5 are: 5, 10, 15, 20, 25 The first 5 multiples of 9 are: 9, 18, 27, 36, 45 The first 5 multiples of both 5 and 9 are: 45, 90, 135, 180, 225
First three common multiples of 5 and 6 are 30, 60 and 90.
The lowest common multiple is 18. The first four common multiples are thus the first four multiples of 18 and are: 18, 36, 54 and 72.
8,16,24,32,40
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 and on to infinity.