The factors of 21 are: 1, 3, 7, 21
The factors of 45 are: 1, 3, 5, 9, 15, 45
The common factors are: 1, 3
The Greatest Common Factor (GCF) is: 3
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It is: 15
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 45 are: 1, 3, 5, 9, 15, 45 The common factors are: 1, 3, 5, 15 The Greatest Common Factor: GCF = 15
The factors of 15 are: 1, 3, 5, 15The factors of 45 are: 1, 3, 5, 9, 15, 45The common factors are: 1, 3, 5, 15The Greatest Common Factor (GCF) is: 15
The greatest common denominator, like the greatest common multiple, is infinite.
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.