Calculate the Greatest Common Factor or GCF of 155 and 1305
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The instructions to find the GCF of 155 and 1305 are the next:
1. Decompose all numbers into prime factors
| 155 | 5 |
| 31 | 31 |
| 1 |
| 1305 | 3 |
| 435 | 3 |
| 145 | 5 |
| 29 | 29 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 155 | = | 5 . 31 |
| Prime factors of 1305 | = | 32 . 5 . 29 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 5
Common prime factors with the lowest exponent: 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 = 51 = 5
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