Calculate the Greatest Common Factor or GCF of 813
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The instructions to find the GCF of 813 are the next:
1. Decompose all numbers into prime factors
813 | 3 |
271 | 271 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 813 | = | 3 . 271 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3 , 271
Common prime factors with the lowest exponent: 31, 2711
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 = 31. 2711 = 813
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