28 and 56
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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
20, 40, 60 and so on.
20, 40, 60 are all common multiples.
1260, 2520, 3780 and so on.
the LCM of 3,4 and 5 is 60