1, 2, 3, 4, 6, 12
1, 2, 4, 5, 10, 20
The GCF is 4.
The GCF of 12 and 20 is 4.
To find the greatest common factor (GCF) of 15 and 20 using the listing method, we first list the factors of each number. The factors of 15 are 1, 3, 5, and 15. The factors of 20 are 1, 2, 4, 5, 10, and 20. The common factor between both numbers is 5, so the GCF of 15 and 20 is 5.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 2.
The GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF of 6, 12, and 20 is 2.
The GCF of 12, 20, and 36 is 4.The GCF is 4.
The GCF is 2.