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Wednesday, October 12 th Please write down Homework and complete Warm UP 1.Is 51 divisible by 6? Why? 2. Is 1,551 prime or composite? Why?

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Presentation on theme: "Wednesday, October 12 th Please write down Homework and complete Warm UP 1.Is 51 divisible by 6? Why? 2. Is 1,551 prime or composite? Why?"— Presentation transcript:

1 Wednesday, October 12 th Please write down Homework and complete Warm UP 1.Is 51 divisible by 6? Why? 2. Is 1,551 prime or composite? Why?

2 Corny Joke of the Day How does the ocean pay it’s water bills? With sand dollars!

3 Schedule for the Week Wednesday: Prime Factorization day #1 Thursday: Syllabus signed! Prime Factorization day #2 Friday: Review and Quiz. WEEKLY REVIEW DUE

4 Review Do you know your divisibility?

5 A number is divisible by 2 if………..

6 A number is divisible by 3 if………..

7 A number is divisible by 4 if………..

8 A number is divisible by 5 if………..

9 A number is divisible by 6 if………..

10 A number is divisible by 9 if………..

11 1,407or 2,303 Are the numbers PRIME or COMPOSITE and why Discuss in your groups the Question of the day…be ready to PROVE your answer!

12 It’s….NOTES TIME!!!!!!!!

13 1. Vocab Review A Prime number is a number that has exactly factors- A Composite Number is a number that has 2 factors. The number is neither prime nor composite because

14 2. Practice,Practice,Practice Tell whether each number is prime or composite a. 33 b. 134 c. 83 d. 99

15 3. Prime Factorization

16 Whole numbers that are multiplied to find a product are called factors of that product. A number is divisible by its factors. 23 6 = Factors Product 2 63 ÷ = 6÷2 = 3 6 is divisible by 3 and 2.

17 What is it? Prime Factorization - writing a number as the product of its prime factors.

18 Method #1 The Tree Method

19 ii. Steps to Prime Factorization a. To find the prime factorization, start with any pair of factors. b. If you have a prime factor, circle it. c. If you have a composite number, continue by listing a pair of factors d. Continue until each branch ends at a prime factor e. Write the prime factors using exponents- smallest base to largest base

20 Choose any two factors of 24 to begin. Keep finding factors until each branch ends at a prime factor. Remember, 2 is PRIME 24 212 6 2 2 3 24 6 4 322 2 24 = 2 2 2 3 24 = 3 2 2 2 The prime factorization of 24 is 2 2 2 3, or 2 3 3. Write the prime factorization of 24.

21 You Try a.16 b. 300 c. 27 d. 81

22 Worktime o Complete double sided worksheet. o Be sure to show your work! Hint: Use your notes to help you


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