Calculate the Greatest Common Factor or GCF of 162, 270 and 486
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The instructions to find the GCF of 162, 270 and 486 are the next:
1. Decompose all numbers into prime factors
| 162 | 2 |
| 81 | 3 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 270 | 2 |
| 135 | 3 |
| 45 | 3 |
| 15 | 3 |
| 5 | 5 |
| 1 |
| 486 | 2 |
| 243 | 3 |
| 81 | 3 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 162 | = | 2 . 34 |
| Prime factors of 270 | = | 2 . 33 . 5 |
| Prime factors of 486 | = | 2 . 35 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3
Common prime factors with the lowest exponent: 21, 33
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. 33 = 54
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