Greatest Common Factor

What is the greatest common factor of 4 and 16?

• 4

• 2

• 1

• 16

What is the GCF of 18 and 36?

What is the GCF of 21 and 49?

GCF 15 and 36

• 8

• 6

• 3

• 4

GCF of 32 and 40

• 2

• 4

• 6

• 8

GCF of 50 and 100

• 10

• 25

• 50

• 5

What is the GCF of 36 and 24?

• 6

• 12

• 8

• 9

What is the greatest factor of 28 and 49?

• 1

• 2

• 7

• 12

GCF of 99 and 54

• 9

• 3

• 6

• 8

What is the GCF of 20 and 30?

• 5

• 2

• 10

• 20