Calculate the Greatest Common Factor or GCF of 20, 332 and 422
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The instructions to find the GCF of 20, 332 and 422 are the next:
1. Decompose all numbers into prime factors
| 20 | 2 |
| 10 | 2 |
| 5 | 5 |
| 1 |
| 332 | 2 |
| 166 | 2 |
| 83 | 83 |
| 1 |
| 422 | 2 |
| 211 | 211 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 20 | = | 22 . 5 |
| Prime factors of 332 | = | 22 . 83 |
| Prime factors of 422 | = | 2 . 211 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2
Common prime factors with the lowest exponent: 21
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 = 2
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