No. The LCM of 4 and 6 is 12.
No but it can be the same as the biggest number as for example the gcf of 30 and 15 is 30
No.
No.
A number can't have a factor greater than itself, so the GCF of a pair of numbers can't ever be greater than the smaller number. The GCF of 9 and 18 is 9.
The LCM is never less than the greatest number in the set. The LCM of 4 and 9 is 36.
No.
Yes, GCF means Greatest Common Factor For example the GCF of 15 and 18 is 3 which is less than both 15 and 18.
No.
I can't give you an example of when that happens because that doesn't ever happen. The GCF of a pair of numbers can't be larger than the smaller number.
No.
No. At most, it can be equal to the smaller number.
Yes. The LCM of 9 and 3 is 9.