140, 280, 420, 560, 700.
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15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
5 10 15 20
20 pinkgal333:20, 40, 60 are all common multiples.
20
The first five common multiples of 12 and 20 are: 12 x 5 = 60 20 x 3 = 60 12 x 10 = 120 20 x 6 = 120 12 x 15 = 180 20 x 9 = 180 12 x 20 = 240 20 x 12 = 240 12 x 25 = 300 20 x 15 = 300