Calculate the Greatest Common Factor or GCF of 126 and 540
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The instructions to find the GCF of 126 and 540 are the next:
1. Decompose all numbers into prime factors
| 126 | 2 |
| 63 | 3 |
| 21 | 3 |
| 7 | 7 |
| 1 |
| 540 | 2 |
| 270 | 2 |
| 135 | 3 |
| 45 | 3 |
| 15 | 3 |
| 5 | 5 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 126 | = | 2 . 32 . 7 |
| Prime factors of 540 | = | 22 . 33 . 5 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3
Common prime factors with the lowest exponent: 21, 32
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 = 21. 32 = 18
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