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Mathematics 15 Online
OpenStudy (anonymous):

What's the LCM of 3 & 5

zepdrix (zepdrix):

Take a bunch of 3's, 3, 6, 9, 12, 15, 18, ... Take a bunch of 5's, 5, 10, 15, 20, 25, ... Figure out when they both have a matching number.

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