180, 360, 540, 720, 900, 1080, 1260, 1440 . . .
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1*180=180 2*180=360 3*180=540 4*180=720
35, 70, 115, 145, 180...
Multiples of 20 include 20, 40, 60, 80, 100, 120, and so on Multiples of 90 include 90, 180, 270, 360, 450, 540, 630, and so on. Common multiples of 20 and 90 include any multiple of 180.
The common multiples of 9, 15, and 20 are an infinite set of multiples of their least common multiple, which is 180. so the common multiples of 9, 15, and 20 are 180, 360, 540, 720, 900, 1080, 1260, 1440, 1620, 1800, and so on.
90, 180, 270, 360