To find the gcf, you need to find the factors for the two numbers (or more). Factors of:
55: 1,5,11,55
75: 1,3,5,15,25,75
Common factors: 1, 5
Greatest common factor: 5
The GCF is 11.
The GCF is 11.
The GCF is 11.
The GCF is 75.
If you mean 300 and 450 then the GCF is 150
The GCF is 75.
The GCF is 75.
The GCF is 75.
The GCF is 75.
The GCF is 75.
The GCF is 1.
The GCF is 1.