• Opener: Check each number below for Opener: Check each number below for divisibilitydivisibility by by 2, 3, 5, 6, 92, 3, 5, 6, 9 and and 1010..

1.)1.) 7,3027,302 2.)2.) 8787 3.)3.) 2222

4.)4.) 4747 5.)5.) 1,0001,000 6.)6.) 3,0303,030

Unit 2

Section 2.2 –Section 2.2 –

Prime FactorizationPrime Factorization

Objective : Objective : to write any whole number as the to write any whole number as the product of primes.product of primes.

VocabularyVocabulary

PrimePrime – –

CompositeComposite – –

FactorizationFactorization – –

ExponentExponent - -

Hard to believe fact:Hard to believe fact: EVERY number (except for 0 EVERY number (except for 0 and 1, but you know how they can be) is created and 1, but you know how they can be) is created by multiplying ONLY prime numbers.by multiplying ONLY prime numbers.

Prime factorization requires you to Prime factorization requires you to factor a number into the primes factor a number into the primes that create it. that create it.

ExampleExample

Way 1Way 1 Way 2Way 2

2424 24 24

ExampleExample

Way 1Way 1 Way 2Way 2

5050 50 50

ExampleExample

Way 1Way 1 Way 2Way 2

120120 120 120

Skill Practice: Complete Skill Practice: Complete prime factorizationsprime factorizations for the for the following problems.following problems.

1.) 1.) 4545 2.) 2.) 4,0004,000 3.) 3.) 7171

4.) 4.) 9999 5.) 5.) 3636 6.) 6.) 6464

Homework:Homework:Course 1: PW p. 59 & 60 evenCourse 1: PW p. 59 & 60 even

Course 2: PW p. 41 & 42 Course 2: PW p. 41 & 42 2-22 even2-22 even

Extensions:Extensions:

ClassZone Animated Math(Chapter 5 – Creating a Factor Tree)