No. 18 doesn't have a factor greater than itself.
No, the GCF of two numbers can never be greater than the smaller number.
No.
no because the GFC has to be equal to or less than the lowest number
No, since GCF stands for greatest common factor, and there is no number over 18 that when divided to 18 and 36 will the answer be a whole number.
36
The mistake is that there is a greater common factor than 18. It's 36. 36 divides 36 evenly. 36 divides 72 evenly.
The GCF is 18.
The GCF of 18 and 36 is 18.
The GCF is 18.
The GCF is 18.
It would be 18.