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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

19893
6633
22113
1717
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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