9 itself is a multiple of 9 since 9x1= 9 and of course it is a factor also
since 18, 27, and 36 do not work, the only other is 9x5=45
So the answers are 9 and 45
Nine and forty_give
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Factors: 1, 3, 5, 9, 15, 45 Multiples: 45, 90, 135, 180, 225...
They are all multiples of 9. Their common multiples are 405, 810, 1215 and so on.
The multiples of 9 are 9,18,27,36,45,54,63,72,81,90,99,108,117,126,135,144, 153,162,171,180......The multiples of 36 are 36,72,108,144,180....the multiples of 45 are 45,90,135,180...The least multiple shared by all 3 numbers is 180. There are always higher ones, but 180 is the lowest one shared.
Because 9 is a multiple of 3, the common multiples of 3 and 9 are the multiples of 9. The first 10 common multiples of 3 and 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, and 90.
It is: 5*9 = 45