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.
The greatest common factor of 26 and 87 is 1.
The greatest common factor of 60 and 87 is 3.
The greatest common factor of 19 and 87 is 1.
The greatest common factor of 87 , 120 = 3
The GCF is 1.
The GCF is 3.
Three is the greatest common factor of 33 and 87.
The highest common factor of 87 and 33 is 3. 87 = 3 x 29 33 = 3 x 11
The Greatest Common Factor (GCF) is: 3
The Greatest Common Factor (GCF) is: 3
The GCF of 14 and 87 is 1.
The GCF of 24 and 87 is 3.