GCF of 253 is 253.
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 GCF is 9. 27/153 = 3/17
The GCF/HCF of 182 and 273 is 91.
Greatest common factor for 102 and 357 is 51.
The GCF is 17.
The GCF is 51.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF of 153 and 270 is 3 * 3 = 9
The GCF is 21.
The GCF is 17.
The GCF is 9. 27/153 = 3/17
The GCF is 17.
The GCF is 3.
The GCF of 306 and 459 is 153.
The GCF is 9.
17