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what's the LCM of 45 and 20?
what's the LCM of 6 and 50?

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    The LCM of 45 and 20 must have one 5, two 3's and two 2's as factors. That makes it 180.

    The LCM of 6 and 50 must have two 5's, one 2 and one 3 as factors.
    5x5x2x3 = ?

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