2. Greatest Common Factor Created by Cristina Salas Leal November 17, 2007

3. Objective The students will list factors of a number and identify the greatest common factor of two or more numbers. The students will list factors of a number and identify the greatest common factor of two or more numbers. TEKS (6.1E) The student is expected to identify factors of a positive integer, common factors, and the greatest common factor of a set of positive integers. TEKS (6.1E) The student is expected to identify factors of a positive integer, common factors, and the greatest common factor of a set of positive integers.

4. Math Journal Write and answer the following questions in your math journal. Write and answer the following questions in your math journal. What does GCF stand for? What does GCF stand for? How do you factor? How do you factor? What is a factor? What is a factor?

5. What is a factor? A factor is whole number that divides into another whole number evenly. A factor is whole number that divides into another whole number evenly. Example: Example: Factors of 12: 1, 2, 3, 4, 6, 12

6. Climb the mountain Factors of 12 Factors of 12 12 1 2 6 3 4

7. Use a Rainbow Use a Rainbow Factors of 18 Factors of 18

8. Beach Clean Up Volunteers arrive at the beach to help pick up trash. There were 32 girls and 24 boys ready to help. The coordinator wanted to divide the boys and girls equally among the groups. How many boys and girls would be needed to make the largest group possible? Volunteers arrive at the beach to help pick up trash. There were 32 girls and 24 boys ready to help. The coordinator wanted to divide the boys and girls equally among the groups. How many boys and girls would be needed to make the largest group possible?

9. Find the GCF List the factors of 32 and 24 List the factors of 32 and 24 32: 1, 2, 4, 8, 16, 32 24: 1, 2, 3, 4, 6, 8, 12, 24 The greatest common factor is 8.

10. Internet Websites Match the answer to the problem on this website. Check to see how many you answered correctly. Match the answer to the problem on this website. Check to see how many you answered correctly. Click Here – GCF GCF Test your self. How many LCM problems can you answer in 60 seconds? Test your self. How many LCM problems can you answer in 60 seconds? Click here – AAAMATH AAAMATH Scroll down and play the Countdown game

11. Thank You