Calculate the Greatest Common Factor or GCF of 27, 54 and 81
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The instructions to find the GCF of 27, 54 and 81 are the next:
1. Decompose all numbers into prime factors
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 54 | 2 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 81 | 3 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 27 | = | 33 |
| Prime factors of 54 | = | 2 . 33 |
| Prime factors of 81 | = | 34 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3
Common prime factors with the lowest exponent: 33
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 = 33 = 27
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