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
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