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SSR. 9/22/08 GCF 2-5 (B or C) # 8. Add the above heading to your table of contents and a new piece of graph paper. G reatest C ommon F actor (GCF). Today: ~correct review assignment ~Greatest Common Factor lesson ~GCF assignment. Announcements:

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  1. SSR

  2. 9/22/08 GCF 2-5 (B or C) # 8 Add the above heading to your table of contents and a new piece of graph paper. Greatest Common Factor (GCF) Today: ~correct review assignment ~Greatest Common Factor lesson ~GCF assignment Announcements: ~Quiz tomorrow on exponents and order of operations (redo cut-off)

  3. 9/22/08 GCF 2-5 (B or C) # 8 VOCABULARY: GCF: largest whole number that divides evenly into the given numbers Example: 10,15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 GCF = 5

  4. 9/22/08 GCF 2-5 (B or C) # 8 List all factors, then choose the largest common factor. Example:24, 36, 48 24: 36: 48:

  5. 15, 50

  6. 9/22/08 GCF 2-5 (B or C) # 8 9/22/08 GCF 2-5 (B or C) # 8 Notes:Greatest Common Factor (GCF) GCF: largest whole number that divides evenly into the given numbers Example: 10,15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 GCF = 5 Boardwork: a. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 b. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 c. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 Assignment:GCF B 7-23 even 1. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5

  7. 9/22/08 GCF 2-5 (B or C) # 8 • 12, 15 • 12, 36, 54 • 22,33 • 45, 75 • 63, 45

  8. 9/22/08 GCF 2-5 (B or C) # 8 Assignment: Practice B: 7-23 odd or even OR Challenge assignment: Practice C: 3-15 odd or even *Show all work on graph paper.

  9. 9/22/08 GCF 2-5 (B or C) # 7 Work on these in order on your graph paper. Once you have shown me two correct problems you may start the assignment: 2-5B 7-23 even or odd or the challenge 2-5C 3-15 even or odd *show all work on graph paper • 12, 15 • 12, 36, 54 • 22,33 • 45, 75 • 63, 45 9/22/08 GCF 2-5 (B or C) # 7 Notes:Greatest Common Factor (GCF) GCF: largest whole number that divides evenly into the given numbers Example: 10,15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 GCF = 5 Boardwork: a. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 b. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 c. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5 Assignment: GCF B 7-23 even 1. 10, 15 10: 1, 2, 5, 10 15: 1, 3, 5, 15 5

  10. 9/22/08 GCF 2-5 (B or C) # 7 Method 2: (Prime factorization) Compute the prime factorization of each number. Circle all common prime factors and multiply together. Example:24, 36, 48 24 3648

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