The common multiples of 9 and 21 are 63, 126, 189 and so on.
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there are infinite amount of common multiples.
Common multiples of 9 and 10 are all of the multiples of 90.
The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27
The least common multiples of the number 6 and 9 is 3.