Calculate the Greatest Common Factor or GCF of 72 and 2790
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The instructions to find the GCF of 72 and 2790 are the next:
1. Decompose all numbers into prime factors
72 | 2 |
36 | 2 |
18 | 2 |
9 | 3 |
3 | 3 |
1 |
2790 | 2 |
1395 | 3 |
465 | 3 |
155 | 5 |
31 | 31 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 72 | = | 23 . 32 |
Prime factors of 2790 | = | 2 . 32 . 5 . 31 |
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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