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There cannot be a common factor 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 16 and 21?
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
What is the greatest common factor of 77 and 21?
The greatest common factor of 21 and 77 is 7.
The common factor of 3 and 21 is 3?
The common factor of 3 and 21 is 3. *
What is the highest common factor of 21 and 14?
7 is the greatest common factor of 14 and 21.
What are the common factors and greatest common factor of 21 and 42?
The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.
What is the greatest common factor of 21 63 and 84?
The Greatest Common Factor of 21, 63, 84: 21
What is the greatest common factor of 21 and 75?
The greatest common factor of 21 and 75 is 3.
What is the greatest common factor of 21 and 162?
The greatest common factor of 21 and 162 is 3.
The greater common factor of 18 21?
The greatest common factor of 18 and 21 is 3.
What is the greatest common factor of 21 and 322?
The greatest common factor of 21 and 322 is 7.
What is the geatest common factor for 21 and 24?
the greatest common factor for 21 and 24 is 3.
What is the greatest common factor for 21 and 56?
The greatest common factor of 21 and 56 is 7.
