Write down the first 3 common multiples of 3 and 9.
Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81
Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81
First 3 common multiples are 9, 18, 27
Answer(s): 9, 18, 27