Greatest Common Factor (GCF)

Find the GCF of 42 and 54.

(a)  

Find the GCF of 34 and 85.

(a)  

Find the GCF of 42, 63, and 84.

(a)  

Find the GCF of 36, 54, and 108

(a)  

The GCF of two prime numbers is 1.

• Sometimes True

• Never True

• Always True

The GCF of two even numbers is 2.

• Sometimes True

• Never True

• Always True

When one number is a multiple of another, the GCF of the numbers is the greater of the numbers.

• Sometimes True

• Never True

• Always True