Greatest Common Factor lesson

What is a factor?

• A number that can be divided by another number

• A number that can be multiplied by another number to get a product

• A number that is greater than another number

• A number that is less than another number

What are the factors of 10?

• 1, 2, 5, 10

• 1, 3, 5, 10

• 1, 2, 5, 15

• 1, 2, 4, 10

What are the other factors of 15?

• 2

• 3

• 5

• 6

• 7

What is the other factor pair of 15?

• 2

• 3

• 4

• 5

• 6

What is the GREATEST COMMON FACTOR of 10 and 15?

What is the greatest common factor of 12 and 6?

• 3

• 12

• 2

• 6

What are the factors of 20?

• 1, 2, 4, 5, 10, 20

• 1, 2, 4, 5, 20

• 1, 2, 5, 10, 20

• 1, 2, 4, 5, 10

What is the GCF of 20 and 10?

What is the greatest common factor of 9 and 21?

• 1

• 3

• 7

• 9