They are 12 and 24
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The first six multiples of 9 are 9, 18, 27, 36, 45, 54. The first six multiples of 12 are 12, 24, 36, 48, 60, 72.
lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.
The common multiples of any two (or more) numbers are multiples of their lowest common multiple (lcm). lcm(9, 11) = 99 → first five common multiples are: 99, 198, 297, 396, 495
Multiples of 983 include 983, 1966, 2949 and 3932. For them to be common, they need to be compared to another set of multiples.
42 and 84