140, 280, 420
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∙ 2014-11-15 01:48:54First three common multiples of 15 and 20 would be: 60,120,180
the first three common multiples of 7, 20, and 35 are 140, 280, and 420
15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.
10, 20, 30
40, 80 & 120.
140, 280, 420
10, 20, 30
20, 40, and 60.
20, 40, 60
10, 20, 30.
They are: 180, 360 and 540