You can't have common multiples of one number. They're just plain multiples. Multiples are found by multiplying the number by successive counting numbers.
288 x 1 = 288
288 x 2 = 576
288 x 3 = 864
Any multiple of 288.
The common multiples of 3 and 16 are all multiples of their LCM, which is 48. Thus, their common multiples are 48, 96, 144, 192, 240, 288, etc.
144, 288, 432
144, 288
144, 288
144, 288, 432 and so on.
144, 288, 432
144, 288, 432
They are: 144, 288 and 432
144, 288, 432
The common multiples of 9 and 16 are 144, 288, 432 and so on.
The multiples are 72 and any multiple of 72: 144, 216, 288 and so on.