Calculate the Greatest Common Factor or GCF of 86, 100 and 120
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The instructions to find the GCF of 86, 100 and 120 are the next:
1. Decompose all numbers into prime factors
| 86 | 2 |
| 43 | 43 |
| 1 |
| 100 | 2 |
| 50 | 2 |
| 25 | 5 |
| 5 | 5 |
| 1 |
| 120 | 2 |
| 60 | 2 |
| 30 | 2 |
| 15 | 3 |
| 5 | 5 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 86 | = | 2 . 43 |
| Prime factors of 100 | = | 22 . 52 |
| Prime factors of 120 | = | 23 . 3 . 5 |
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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