What is the gcf of 9 and 27?

The greatest common factor (GCF) of two numbers is the largest number that divides evenly into both numbers.

To find the GCF of 9 and 27, we can first list out the factors of each number:

For 9: 1, 3, 9 For 27: 1, 3, 9, 27

The numbers that both 9 and 27 have in common as factors are 1, 3, and 9. The largest of these common factors is 9, so the GCF of 9 and 27 is 9.