The factors of 21 - in ascending order are... 1,3,7 & 21
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You need at least two numbers to find a gcf.
the greatest common factor is 4. 2 and 4 are the only common factors of 100 and 24.
There cannot be a greatest 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.
The greatest factor of any number is the number itself. The greatest common factor of 24 and 36 is 12.
The greatest common factor is four.