81, 162, 243, 324, 405, 486, 567, 648, 729, 810, 891, 972.
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I presume you mean what are all the multiples of 9 up to 100 (and not what are all the multiples of 9, 10, 11, ..., 100 of which there are infinitely many): 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
All multiples of 3 have digits that add up to a multiple of 3. There are 333 multiples of 3 between 1 and 1000.
All multiples of 3 have digits that add up to a multiple of 3. There are 333 multiples of 3 between 1 and 1000.
There are 11 multiples of 9 up to 100. 9 18 27 36 45 54 63 72 81 90 99
That the sum of its digits add up to 9 as for example 9*9 = 81 and 8+1 = 9