Wednesday, October 12th

• Please write down Homework and complete Warm UP

1. Is 51 divisible by 6? Why?

2. Is 1,551 prime or composite? Why?

Warm Up

Corny Joke of the Day

How does the ocean pay it’s water bills?

With sand dollars!

Schedule for the Week

Wednesday: Prime Factorization day #1Thursday: Syllabus signed! Prime Factorization day #2Friday: Review and Quiz. WEEKLY

REVIEW DUE

Review Do you know your divisibility?

A number is divisible by 2

if………..

A number is divisible by 3

if………..

A number is divisible by 4

if………..

A number is divisible by 5

if………..

A number is divisible by 6

if………..

A number is divisible by 9

if………..

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!

It’s….NOTES TIME!!!!!!!!

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

2. Practice,Practice,Practice

Tell whether each number is prime or composite

a. 33b. 134c. 83d. 99

3. Prime Factorization

• 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=

FactorsProduct

26 3÷ =

6 ÷2 = 36 is divisible by 3 and 2.

i. Vocab

What is it?

Prime Factorization- writing a number as the product of its

prime factors.

Method #1

The Tree Method

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

Choose any two factors of 24 to begin. Keep finding factors until each branch ends at a prime factor.

Remember, 2 is PRIME24

2 12•

6

2

2 •

3•

24

6 4•

3 2 2 2

24 = 2 • 2 • 2 • 3

24 = 3 • 2 • 2 • 2

The prime factorization of 24 is 2 • 2 • 2 • 3, or 23 • 3.

• •

Write the prime factorization of 24.

Just Watch

OR

You Try

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

Worktimeo Complete double sided worksheet.

o Be sure to show your work!

Hint: Use your notes to help you