1. Finding The Greatest Common Factor
NS.4

2. What is a factor? What are the factors of 12:
Factor- the numbers you multiply to get a product
Factor x Factor = Product
What are the factors of 12:

3. What is a common factor?
Common factor- a number that is a factor of two or more given numbers.
What are the common factors of 12 and 18?

4. What is the Greatest Common Factor or GCF?
GCF- the greatest whole number that is a factor of each number.
There are 3 ways to find the GCF: 1. Prime Factorization 2. List Method 3. 6th grade-Method

5. Prime Factorization- I DO
What is the greatest common factor of 12 and 18?

6. Prime Factorization- WE DO
What is the greatest common factor of 30 and 50?

7. Prime Factorization- YOU DO
What is the GCF of 18 and 9?

8. CIRCLE the Common Factors Put a TRIANGLE around the GCF
List Method- I DO
What is the GCF of 12 and 24?
CIRCLE the Common Factors Put a TRIANGLE around the GCF

9. CIRCLE the Common Factors Put a TRIANGLE around the GCF
List Method- WE DO
What is the GCF of 9 and 11?
CIRCLE the Common Factors Put a TRIANGLE around the GCF

10. CIRCLE the Common Factors Put a TRIANGLE around the GCF
List Method- YOU DO
What is the GCF of 8 and 16?
CIRCLE the Common Factors Put a TRIANGLE around the GCF

11. 6th grade Method- I DO
What is the GCF of 8 and 20?

12. 6th grade Method- WE DO
What is the GCF of 32 and 48?

13. 6th grade Method- YOU DO
What is the GCF of 45 and 30?

14. The Distributive Property
Analyze this example of how factors apply to the distributive property.
REMEMBER A FACTOR X FACTOR= MULTIPLE
GCF(a) +GCF(b)= GCF(a+b)

15. The Distributive Property- WE DO
Find the GCF of the numbers 15 and 25. Then Rewrite it using the distributive property.

16. The Distributive Property- YOU DO
Find the GCF of the numbers 36 and 24.Then Rewrite it using the distributive property.

17. Exit Ticket
What is the GCF of 10 and 35?