420, 840, 1260 and so on.
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14, 28, 42, 56, 70
Some multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
28 + 42 = 70
look at the muliples of 10 10, 20, 30, 40, 50, 60, 70, etc and now look at the multiples of 14 14, 28, 42, 56, 70 so 70 is a multiple of 10 and 14 and it is the LCM.