Greatest Common Factor

What is a factor?

• A number that is divisible by another number

• The answer to an addition problem

• another name for PEMDAS

• The answer to a subtraction problem

What is a greatest common factor?

• The answer to a division problem

• The top number of a fraction

• The biggest number that is divisible by 2 numbers

True or false:

1 is a factor of 10

• true

• false

Answer explanation

True because you can multiply 1 x 10 to get 10 and you can divide 10 divided by 1

What is another factor pair of 15?

• 3, 5

• 2, 10

• 10, 5

• 7, 8

Answer explanation

3 x 5 = 15

What are all of the factors of 6?

12: 1, 2, 3, 4, 6, 12

6: 1, 2, 3, 6

What is the greatest common factor of 12 & 6?

• 1

• 2

• 3

• 6

What is the greatest common factor of 10 and 20?

• 5

• 10

• 200

• 1

What are all of the factors of 9? (hint: there are 3)

What are all of the factors of 21?

What is the greatest common factor of 9 and 21?