The smallest three common mulltiples of 6 and 24 are 24, 48, and 72.
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Multiples of 983 include 983, 1966, 2949 and 3932. For them to be common, they need to be compared to another set of multiples.
A single number cannot have common multiples, until you are comparing it with one or more other numbers.
Example: Find the LCM of 12 and 30.Write the multiples of 12: 12, 24, 36, 48, 60, 72, ...Write the multiples of 30: 30, 60, 90, ...The first number you find which is in both lists is the LCM: 60.
The first 5 common multiples are the first 5 multiples of their lowest common multiple (LCM) LCM(9, 10) = 90 → first 5 common multiples are 90, 180, 270, 360, 450.
IF they are integers, then the first number is a multiple of the second and the second is a factor of the first.