They are any multiples of 30
The common multiples of 1 and 6 are the same as the multiples of 6. They are 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, and so on.
The common multiples of 5 and 6 are the multiples of their lowest common multiple (which is 30), so there are infinitely many common multiples of 5 and 6. The first five are: 30, 60, 90, 120, 150.
60
30 and 60
The common multiples of any numbers are multiples of their lcm. The lcm of 2, 3, 4, 5 & 6 is 60 Thus the next four common multiples are 2 x 60, 3 x 60, 4 x 60 & 5 x 60 which are 120, 180, 240 & 300
All multiples of 840 are common multiples of 60 and 280
30 and 60
30, 60, and 90
They are: 30, 60 and 90
24 & 48
60, 120, 180, etc.