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10 September, 13:26

Find the GCF and the LCM of 18 and 20

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  1. 10 September, 13:55
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    GCF = 2

    LCM=180

    Step by step for GCF=

    The prime factorization of 20 is 2,5

    The prime factorization of 18 is 2,3

    The common multiple they share is 2

    Step by step for LCM=

    the prime factorization of 18

    18 = 2 * 3 * 3

    the prime factorization of 20

    20 = 2 * 2 * 5

    Multiply each factor the greater number of times it occurs to find lcm

    LCM = 2 * 2 * 3 * 3 * 5

    LCM = 180
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