They are: 8, 16, 24.
The first three multiples of 4 are 4, 8 and 12. For them to be common, they need to be compared to another set of multiples.
4, 8 and 12 are the first 3 common multiples of 2 and 4
The first three multiples of 4 are 4, 8 and 12. For them to be common, they need to be compared to another set of multiples.
8 16 24
8, 16, 24
2 8 12
24, 48, 72.
40, 80, 120
24, 48, 72
24, 48, 72
40, 80, 120
They are: 40 80 and 120