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Write the prime factorization of each number listed below. Then find the least common multiple and the greatest common factor of each pair of numbers.  

  1.  and 

    Factor both numbers. The number or numbers they both have are the GCF.
    In this case, it is .

    Prime factorization:

    Check the multiples of the larger number, 24, until you find one divisible by the smaller number, 3.
    Start with (24)(1).

    LCM is 24.
    GCF is 3.

  1. and 9

    Refer to the steps for part (a).

    7 is a prime number, which means its only factors are 1 and itself.

  1. and

    Refer to the steps for part (a).

    LCM is . Can you find the greatest common factor?