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.
The greatest common factor of 115 and 299 is 23.
The greatest common factor of 75 and 115 is 5.
The greatest common factor of 115 and 224 is 1.
The Greatest Common Factor of 75, 115, 150: 5
The greatest common factor is 5.
The greatest common factor for {115, 230, 345} is 115. Note that 115 x 2 = 230, and 115 x 3 = 345.
The greatest common factor (GCF) is 5.
1
It is: 5
5
The GCF of 51 and 115 is 1.
The Greatest Common Factor (GCF) is: 5