Calculate the Greatest Common Factor or GCF of 1215
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The instructions to find the GCF of 1215 are the next:
1. Decompose all numbers into prime factors
1215 | 3 |
405 | 3 |
135 | 3 |
45 | 3 |
15 | 3 |
5 | 5 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 1215 | = | 35 . 5 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3 , 5
Common prime factors with the lowest exponent: 35, 51
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 = 35. 51 = 1215
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