Calculate the Greatest Common Factor or GCF of 72 and 2808
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The instructions to find the GCF of 72 and 2808 are the next:
1. Decompose all numbers into prime factors
72 | 2 |
36 | 2 |
18 | 2 |
9 | 3 |
3 | 3 |
1 |
2808 | 2 |
1404 | 2 |
702 | 2 |
351 | 3 |
117 | 3 |
39 | 3 |
13 | 13 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 72 | = | 23 . 32 |
Prime factors of 2808 | = | 23 . 33 . 13 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2 , 3
Common prime factors with the lowest exponent: 23, 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 = 23. 32 = 72
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