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Thursday Schedule - Frenzy - Math Notebook - G.C.F. Notes.

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Presentation on theme: "Thursday Schedule - Frenzy - Math Notebook - G.C.F. Notes."— Presentation transcript:

1 Thursday Schedule - Frenzy - Math Notebook - G.C.F. Notes

2 What numbers can be multiplied together to get 24? 1 x 24 2 x 12 3 x 8 4 x 6 The numbers 1, 2, 3, 4, 6, 8, 12, and 24 are called factors. These are the numbers being multiplied together. What are the factors of seven? 1 x 7 Good thing we just took notes on divisibility rules!

3 Greatest Common Factor (GCF) greatest largest shareThe greatest common factor is the largest factor that two numbers share. 1242Let’s find the GCF of 12 and 42! – First, we need to make a list of factors for each number…

4 12 1 x 12 2 x 6 3 x 4 4 x 3 Factors of 12: 1, 2, 3, 4, 6,12 42 1 x 42 2 x 21 3 x 14 4 x ?? 5 x ?? 6 x 7 7 x 6 Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42 Common Factors: 1, 2, 3, 6 Greatest6 Greatest Common Factor: 6 Use your divisibility rules to help find factors!

5 1827 What is the GCF of 18 and 27?1827 1 x 18 2 x 9 3 x 6 4 x ? 5 x ? 6 x 3 Factors of 18: 1, 2, 3, 6, 9, 18 1 x 27 2 x ? 3 x 9 4 x ? 5 x ? 6 x ? 7 x ? 8 x ? 9 x 3 Factors of 27: 1, 3, 9, 27 Common Factors: 1, 3, 9 9 GCF: 9

6 whiteboards Time for white boards! Let’s practice finding the GCF of the following sets of numbers: 10 and 15 6 and 18 12 and 16 7 and 4 5 6 4 1

7 Homework Time!


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