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Calculate the Greatest Common Factor or GCF of 628

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The instructions to find the GCF of 628 are the next:

1. Decompose all numbers into prime factors

6282
3142
157157
1

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

Prime factors of 628=22 . 157

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2 , 157

Common prime factors with the lowest exponent: 22, 1571

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. 1571 = 628


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