Calculate the Greatest Common Factor or GCF of 1989
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The instructions to find the GCF of 1989 are the next:
1. Decompose all numbers into prime factors
1989 | 3 |
663 | 3 |
221 | 13 |
17 | 17 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 1989 | = | 32 . 13 . 17 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 3 , 13 , 17
Common prime factors with the lowest exponent: 32, 131, 171
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 = 32. 131. 171 = 1989
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