there is only one, 90
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.
There are fourteen multiples of seven that are under 100.
60 and 42 have no common multiples under 100.
9,18,27,36,45,54,63,72,81,90,99
Multiples of 9 up to 100 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99. Multiples of 10 up to 100 are 10, 20, 30, 40, 50, 60, 70, 80. 90, 100. The only common multiple up to 100 of 9 and 10 is 90.
There are 11 multiples of 9 up to 100. 9 18 27 36 45 54 63 72 81 90 99
100 of them.
9 (3 is a factor of 9 tho...) the rest of the multiples would be 18, 27, 36... etc
11
9,18,27,36,45,54,63,72,81,90,99