Calculate the Greatest Common Factor or GCF of 38, 95 and 171
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The instructions to find the GCF of 38, 95 and 171 are the next:
1. Decompose all numbers into prime factors
| 38 | 2 |
| 19 | 19 |
| 1 |
| 95 | 5 |
| 19 | 19 |
| 1 |
| 171 | 3 |
| 57 | 3 |
| 19 | 19 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 38 | = | 2 . 19 |
| Prime factors of 95 | = | 5 . 19 |
| Prime factors of 171 | = | 32 . 19 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 19
Common prime factors with the lowest exponent: 191
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 = 191 = 19
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