Calculate the Greatest Common Factor or GCF of 684
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The instructions to find the GCF of 684 are the next:
1. Decompose all numbers into prime factors
| 684 | 2 |
| 342 | 2 |
| 171 | 3 |
| 57 | 3 |
| 19 | 19 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 684 | = | 22 . 32 . 19 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3 , 19
Common prime factors with the lowest exponent: 22, 32, 191
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. 32. 191 = 684
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