Calculate the Greatest Common Factor or GCF of 54, 72 and 198
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The instructions to find the GCF of 54, 72 and 198 are the next:
1. Decompose all numbers into prime factors
| 54 | 2 |
| 27 | 3 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 72 | 2 |
| 36 | 2 |
| 18 | 2 |
| 9 | 3 |
| 3 | 3 |
| 1 |
| 198 | 2 |
| 99 | 3 |
| 33 | 3 |
| 11 | 11 |
| 1 |
2. Write all numbers as the product of its prime factors
| Prime factors of 54 | = | 2 . 33 |
| Prime factors of 72 | = | 23 . 32 |
| Prime factors of 198 | = | 2 . 32 . 11 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3
Common prime factors with the lowest exponent: 21, 32
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. 32 = 18
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