There are 11 multiples of 9 less than 100. They are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 and 99.
63
72
6 of them
infinite; positive are 9
Multiples of 9 less than 70 are: 9, 18, 27, 36, 45, 54, 63. So the greatest multiple of 9 that is less than 70 is 63.
9,18,27,36,45,54,63,72,81,90,99
63
itzz 63
Just 49
99 is your only one
45, 54
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
6 of them
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
infinite; positive are 9
the common multiples between 1 and 100 for 9 and 10 are just 90!
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.