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There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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What is the greatest common factor of 55 and 99?
The greatest common factor of 55 and 99 is 11.The GCF of 55 and 99 is 11.
What is the greatest common factor of 45 81 and 99?
The greatest common factor is 9
Which pair of numbers has a greatest common factor that is a prime number 54 and 99 or 80 and 114?
The greatest common factor of 54 and 99 is 9, which is not prime. The greatest common factor of 80 and 114 is 2, which is prime.
What is the greatest common factor of 85833 and 10890?
99
What is the greatest common factor of 21 and 99?
The greatest common factor of 21 and 99 is 3. 21's factors are 1,3,and 7 99's factors are 1,3,9,11 33 (there may be more factors of 99). The highest factor that both number have in common are 3.
