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Calculate the Greatest Common Factor or GCF of 84

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The instructions to find the GCF of 84 are the next:

1. Decompose all numbers into prime factors

842
422
213
77
1

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

Prime factors of 84=22 . 3 . 7

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2 , 3 , 7

Common prime factors with the lowest exponent: 22, 31, 71

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. 71 = 84


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