Calculate the Greatest Common Factor or GCF of 621 and 969
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The instructions to find the GCF of 621 and 969 are the next:
1. Decompose all numbers into prime factors
| 621 | 3 |
| 207 | 3 |
| 69 | 3 |
| 23 | 23 |
| 1 |
| 969 | 3 |
| 323 | 17 |
| 19 | 19 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 621 | = | 33 . 23 |
| Prime factors of 969 | = | 3 . 17 . 19 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3
Common prime factors with the lowest exponent: 31
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 = 3
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