How do you find the Least common multiple of 20, 30?

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##lcm(20,30)=60##

multiples of 20:##" "{20,40,60,80,100,120,140,160,180..}##

multiples of 30:##" "{30,60,90,120,150,180,...}##

common multiples;##" "{60,120,180...}##

##lcm(20,30)=60##

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