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Finding the Greatest Common Factor

Finding the Greatest Common Factor. Grade 5. Lesson Objectives. 6.B.1.c Identify the greatest common factor 3.A.1.a Use technology tools, including software and hardware, from a range of teacher-selected options to learn a new content or reinforce skills. Think Backwards….

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Finding the Greatest Common Factor

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  1. Finding the Greatest Common Factor Grade 5

  2. Lesson Objectives • 6.B.1.c Identify the greatest common factor 3.A.1.a Use technology tools, including software and hardware, from a range of teacher-selected options to learn a new content or reinforce skills

  3. Think Backwards… • Find Factors • Circle Common Factors • Group Greatest Factor

  4. Step 1: Find the Factors • 24 – 1,2,3,4,6,8,12,24 • 36 – 1,2,3,4,6,9,12,18,36

  5. Step 2: Circle Common Factors • 24 – 1,2,3,4,6,8,12,24 • 36 – 1,2,3,4,6,9,12,18,36

  6. Step 3: Group the Greatest Factor • 24 – 1,2,3,4,6,8,12,24 • 36 – 1,2,3,4,6,9,12,18,36

  7. The Greatest Common Factor of 24 and 36 is… 12

  8. Now let’s try finding the GCF

  9. Find the GCF of 12 and 24 • Step 1: Find the factors • 12 – 1,2,3,4,6,12 • 24 – 1,2,3,4,6,8,12,24

  10. Find the GCF of 12 and 24 • Step 2: Circle the common factors • 12 – 1,2,3,4,6,12 • 24 – 1,2,3,4,6,8,12,24

  11. Find the GCF of 12 and 24 • Step 3: Group the greatest factor • 12 – 1,2,3,4,6,12 • 24 – 1,2,3,4,6,8,12,24

  12. The Greatest Common Factor of 12 and 24 is … 12

  13. Your turn! • Find the Greatest Common Factor of 16 and 20. • Remember…Find Factors, Circle Common, Group Greatest!

  14. The Greatest Common Factor of 16 and 20 is… 4

  15. Are you ready? Let's try some more!

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