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Calculate the Greatest Common Factor or GCF of 660

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The instructions to find the GCF of 660 are the next:

1. Decompose all numbers into prime factors

6602
3302
1653
555
1111
1

2. Write all numbers as the product of its prime factors

Prime factors of 660=22 . 3 . 5 . 11

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2 , 3 , 5 , 11

Common prime factors with the lowest exponent: 22, 31, 51, 111

4. Calculate the Greatest Common Factor or GCF

Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.

GCF = 22. 31. 51. 111 = 660


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