The GCF of one number is itself.
The denominator for any whole number is 1.
If you mean the three numbers, 12, 16, and 18 - try it out! Use a calculator to check whether 122 + 162 = 182 or not.
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is 1.
The GCF is: 1
The GCF is 27.
The GCF is 3.
The GCF is 2.