What is the gcf of 42 and 54?

The greatest common factor (GCF) of 42 and 54 is 6.

To find the GCF, you can list the factors of each number and identify the largest factor that is common to both numbers.

Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42 Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54

The largest factor that is common to both 42 and 54 is 6, therefore the GCF of 42 and 54 is 6.