Multiples of 9 include 9, 18, 27 and so on. For them to be common, they need to be compared to another set of multiples.
Itself and any other multiples of 9
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Each common multiple of 9 and 10 occurs exactly once (in the list of common multiples), so there is no common multiple that occurs the most. All common multiples of 9 and 10 are the multiples of their least common multiple which is 90.
Just 72. It was found by multiplying 8 and 9. --------------------------------------- The common multiples of two numbers are the multiples of their lowest common multiple. LCM(8, 9) = 72 The common multiples of 8 and 9 are 72, 144, 216, ... The only common multiples less than 100 are 72 only.
Not all of them are. Consider 27. 6 and 9 share a lot of common multiples because they share a common factor.
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
the common multiples between 1 and 100 for 9 and 10 are just 90!