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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: - PowerPoint PPT PresentationTRANSCRIPT
SSR
Add the above heading to your table of contents and a new piece of graph paper.
Greatest Common Factor
(GCF)
9/22/08 GCF 2-5 (B or C) # 8
Announcements:
~Quiz tomorrow on exponents and order of operations (redo cut-off)
Today:
~correct review assignment
~Greatest Common Factor lesson
~GCF assignment
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
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:
9/22/08 GCF 2-5 (B or C) # 8
15, 50
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
9/22/08 GCF 2-5 (B or C) # 8
a.12, 15
b.12, 36, 54
c.22,33
d.45, 75
e.63, 45
Assignment:
Practice B: 7-23 odd or even
OR
Challenge assignment:
Practice C: 3-15 odd or even
*Show all work on graph paper.
9/22/08 GCF 2-5 (B or C) # 8
9/22/08 GCF 2-5 (B or C) # 7
a.12, 15
b.12, 36, 54
c.22,33
d.45, 75
e.63, 45
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
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
Method 2: (Prime factorization) Compute the prime factorization of each number. Circle all common prime factors and multiply together.
Example: 24, 36, 48
24 36 48
9/22/08 GCF 2-5 (B or C) # 7