Greatest Common Factor

Concept:



How To Use the Concept:

    To find the Greatest Common Factor (GCF) of two numbers, find the largest number that will divide evenly into both numbers.

    Example: find the GCF of 25 and 15.
    Factors of 25:1,5,25
    Factors of 15:1,3,5,15
    The largest number that will divide evenly into 25 and 15 is 5.

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1. What is the GCF of 12 and 18?


2. What is the GCF of 12 and 24?


3. What is the GCF of 9 and 12?


4. What is the GCF of 12 and 21?


5. What is the GCF of 6 and 36?


6. What is the GCF of 25 and 40?


7. What is the GCF of 3 and 72?


8. What is the GCF of 27 and 36?


9. What is the GCF of 8 and 24?


10. What is the GCF of 10 and 70?


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