The multiples of 12 are 12, 24, 36, 48, 60, 72, 84, 96, 108, and so on. The multiples of 20 are 20, 40, 60, 80, 100, 120, 140, 160, 180, and so on.
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21
The first five multiples of 4 are 4, 8, 12, 16 and 20. For them to be common, they need to be compared to another set of multiples.
Any multiples of 20.
The multiples of 246 and 12 are 492 and all the multiples of 492.
The multiples of 20 are20,40,60,80,100,120,140,160,180,200,220...The multiples of 40 are40,80,120,160,200,240,280,420...The three smallest are 40,80,120