Calculate the Greatest Common Factor or GCF of 915
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The instructions to find the GCF of 915 are the next:
1. Decompose all numbers into prime factors
| 915 | 3 |
| 305 | 5 |
| 61 | 61 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 915 | = | 3 . 5 . 61 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3 , 5 , 61
Common prime factors with the lowest exponent: 31, 51, 611
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. 51. 611 = 915
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