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21 April, 21:09

What is the greatest common factor of 18 and 72

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  1. 21 April, 21:32
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    You need to find the common primes ...

    18=2*3*3 and 72=2*2*2*3*3 so they have 2*3*3 in common and

    2*3*3=18

    So 18 is the greatest common factor.
  2. 21 April, 21:34
    0
    Greatest Common Factor (GCF) : Largest factor of two or more numbers

    Factors of 18: 1, 2, 3, 6, 9, 18

    Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

    Largest number in both of the lists: 18

    GCF: 18
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