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

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

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Review Do you know your divisibility?

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A number is divisible by 2 if………..

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A number is divisible by 3 if………..

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A number is divisible by 4 if………..

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A number is divisible by 5 if………..

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A number is divisible by 6 if………..

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A number is divisible by 9 if………..

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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!

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It’s….NOTES TIME!!!!!!!!

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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

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

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3. Prime Factorization

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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.

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

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Method #1 The Tree Method

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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

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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.

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

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

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