Calculate the Greatest Common Factor or GCF of 1620
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The instructions to find the GCF of 1620 are the next:
1. Decompose all numbers into prime factors
| 1620 | 2 |
| 810 | 2 |
| 405 | 3 |
| 135 | 3 |
| 45 | 3 |
| 15 | 3 |
| 5 | 5 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 1620 | = | 22 . 34 . 5 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3 , 5
Common prime factors with the lowest exponent: 22, 34, 51
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. 34. 51 = 1620
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