GCF (greatest common factor) is the greatest factor shared by two or more numbers. Because you only gave one number, GCF cannot be determined.
Since 32 is a factor of 256, it is automatically the GCF.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 4.The GCF is 4.
Since 4 is a factor of 20, it is automatically the GCF.
The GCF is 4.
The GCF is 4.
The GCF is 4.