Calculate the Greatest Common Factor or GCF of 42000
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The instructions to find the GCF of 42000 are the next:
1. Decompose all numbers into prime factors
| 42000 | 2 |
| 21000 | 2 |
| 10500 | 2 |
| 5250 | 2 |
| 2625 | 3 |
| 875 | 5 |
| 175 | 5 |
| 35 | 5 |
| 7 | 7 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 42000 | = | 24 . 3 . 53 . 7 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3 , 5 , 7
Common prime factors with the lowest exponent: 24, 31, 53, 71
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 = 24. 31. 53. 71 = 42000
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