Calculate the Greatest Common Factor or GCF of 132 and 680
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The instructions to find the GCF of 132 and 680 are the next:
1. Decompose all numbers into prime factors
| 132 | 2 |
| 66 | 2 |
| 33 | 3 |
| 11 | 11 |
| 1 |
| 680 | 2 |
| 340 | 2 |
| 170 | 2 |
| 85 | 5 |
| 17 | 17 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 132 | = | 22 . 3 . 11 |
| Prime factors of 680 | = | 23 . 5 . 17 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2
Common prime factors with the lowest exponent: 22
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 = 22 = 4
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