What is the greatest common factor of 35 and 55?

The greatest common factor (GCF) of two numbers is the largest number that divides both numbers evenly. To find the GCF of 35 and 55, you can list the factors of each number and identify the largest factor they have in common. The factors of 35 are 1, 5, 7, and 35, while the factors of 55 are 1, 5, 11, and 55. The largest factor that both numbers share is 5, so the GCF of 35 and 55 is 5.