Calculate the Greatest Common Factor or GCF of 217
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The instructions to find the GCF of 217 are the next:
1. Decompose all numbers into prime factors
| 217 | 7 |
| 31 | 31 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 217 | = | 7 . 31 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 7 , 31
Common prime factors with the lowest exponent: 71, 311
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 = 71. 311 = 217
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