60, 120, 180 and so on.
They are any multiples of 30
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.
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.
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
60, 120, 180, etc.
They are: 30, 60 and 90
24 & 48