You need at least two numbers to find a GCF.
The GCF is 30.
The GCF is 30.
The GCF of 11 and 44 is 11. The GCF of 20 and 30 is 10. The GCF of 5 and 11 is 1. The GCF of all of them is 1.
The GCF of 120, 150, and 180 is 30. The GCF of a set can't be larger than the smallest difference between numbers in the set, which, in this case, is 30. Since 30 is a factor of all of the numbers of the set, it is the GCF.
The GCF is: 1
The GCF is 3.
The GCF is 2.
The GCF is 1.
The GCF is 3.
The GCF is 6.
The GCF is 6.
The GCF is 1.