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math

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What is the greatest common factor of 18, 30, and 45? I come up with 3 as the greatest common factor am I right?

  • math -

    Yes. You're right.

  • math -

    18 = 3*3*2
    30 = 5*3*2
    45 = 5*3*3
    so
    3 is the biggest factor that is in all three.

    by the way for the smallest common multiple
    we need two 3s and one 2 and one 5
    3*3*2*5 = 90 (used to get least common denominator

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