The sum of the digits in each multiple is 9 .
It also works just fine for ' 1 '.
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I don't know about "magic" in this context. Multiples are the number 9, multiplied by an integer, for example: 0 x 9 = 0 1 x 9 = 9 2 x 9 = 18 etc. If you just keep adding 9 at a time, you will get all the multiples.
There are 5 multiples of 9. There are 4 multiples of 12. There is 1 number that is a multiple of both, 36.
They are multiples of 1, 3, and 9.
1, 9, and 81 are the only multiples of 81
9,18,27,36,45,54,63,72,81,90,99