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**Please write down Homework and complete Warm UP**

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

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**How does the ocean pay it’s water bills? With sand dollars!**

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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**Do you know your divisibility?**

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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**1,407 or 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! 1,407 or 2,303 Are the numbers PRIME or COMPOSITE and why

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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 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 33 134 83 99

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3. Prime Factorization

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

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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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**Write the prime factorization of 24.**

Just Watch Write the prime factorization of 24. Choose any two factors of 24 to begin. Keep finding factors until each branch ends at a prime factor. Remember, 2 is PRIME 24 24 2 • • 12 OR 6 4 2 • 6 3 • 2 2 • 2 2 • 3 24 = 3 • 2 • 2 • 2 24 = 2 • 2 • 2 • 3 The prime factorization of 24 is 2 • 2 • 2 • 3, or 23 • 3.

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

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**Worktime Complete double sided worksheet. Be sure to show your work!**

Hint: Use your notes to help you

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DIVISIBILITY, FACTORS & MULTIPLES

DIVISIBILITY, FACTORS & MULTIPLES

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