The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
The greatest common factor of 42 and 225 is 3.
The GCF is 25.
The GCF is 45.
The GCF is 75.
The GCF is 25.
The GCF is 45.
The GCF is 75.
The GCF is 25.
The GCF is 3.
The GCF is 9.
The GCF is 9.
The GCF/HCF of 360 and 225 is 45.
The GCF of 225 and 500 is 25.