9
18 = 9
27 =9
36 = 9
etc
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There are infinitely many multiples of 9 and it is not possible to add them all.
10. They are the first ten multiples of 9.
That the sum of its digits add up to 9 as for example 9*9 = 81 and 8+1 = 9
They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
The first 5 multiples of 9 are: 9, 18, 27, 36, and 45.