# Do Now 11/30/09 Copy HW in your planner. Copy HW in your planner. –Text page 175, #16-44 multiples of 4; #48-54 evens Be ready to copy POTW #3 Be ready.

## Presentation on theme: "Do Now 11/30/09 Copy HW in your planner. Copy HW in your planner. –Text page 175, #16-44 multiples of 4; #48-54 evens Be ready to copy POTW #3 Be ready."— Presentation transcript:

Do Now 11/30/09 Copy HW in your planner. Copy HW in your planner. –Text page 175, #16-44 multiples of 4; #48-54 evens Be ready to copy POTW #3 Be ready to copy POTW #3 In your journal, answer the question below using the following definition. A factor of a number is a number that can be divided into the given number without a remainder. Which number do you think has more factors 24 or 29? Why? In your journal, answer the question below using the following definition. A factor of a number is a number that can be divided into the given number without a remainder. Which number do you think has more factors 24 or 29? Why? (Hint: List all of the factors of the number 24 and 29) (Hint: List all of the factors of the number 24 and 29)

Chapter 4 “Factors, Fractions, and Exponents” Section 4.1 “Factors and Prime Factorization” Section 4.2 “Greatest Common Factor” Section 4.3 “Equivalent Fractions” Section 4.4 “Least Common Multiple” Section 4.5 “Rules of Exponents” Section 4.6 “Negative and Zero Exponents” Section 4.7 “Scientific Notation”

Objective SWBAT write the prime factorization of a number SWBAT write the prime factorization of a number SWBAT write the prime factorization of a monomial SWBAT write the prime factorization of a monomial

Section 4.1 “Factors and Prime Factorization” Natural numbers are classified according to how many factors they have: (1) Prime numbers: -a whole number that is greater than 1 and has exactly TWO factors, itself and 1. (2) Composite numbers: -a whole number that is greater than 1 and has -a whole number that is greater than 1 and has more than two factors. more than two factors. (3) The number 1: 1 is neither prime nor composite. 1 is neither prime nor composite.

“Prime or Composite?” 6 4 7 8 2 5 Prime C Composite 3 1Neither

Factoring Natural Numbers A natural number is FACTORED when it is written as the product of two or more numbers. –Y–Y–Y–You can use divisibility tests to find factors of numbers. –E–E–E–Example: 39 ÷ 3 = 13 3 · 13 = 39 dividend divisor quotient factor product

Factoring Natural Numbers You can use TREE DIAGRAMS to factor a number until all factors are primes. 30 103 325 ∙ ∙∙ 30 152 235 ∙ ∙∙ 30 65 523 ∙ ∙∙ Prime Factorization **HINT Write your factors in increasing order. -writing a number as a product of prime factors.

Factoring Natural Numbers Write the prime factorization of the following numbers using tree diagrams. Write the prime factorization of the following numbers using tree diagrams. 40 85 524 ∙ ∙∙ 225 455 5315 ∙ ∙∙**HINT Write your factors in increasing order. 522∙∙2∙ 222∙∙5∙ When you have repeating factors use exponents. ³ 25∙ 35∙53∙∙ 55∙33∙∙ ² 35∙ ²

Monomial a number, x 3x³yz² or the product of a number and one or more variables with whole number exponents or the product of a number and one or more variables with whole number exponents a variable, a variable, 7 To FACTOR a monomial, write the monomial as a product of prime numbers and variables with exponents of 1. To FACTOR a monomial, write the monomial as a product of prime numbers and variables with exponents of 1. 3a³ = 3 · a · a · a

Factoring Algebraic Expressions Factor each monomial. Factor each monomial. 63a³ 18x²y = 3 · 3 · 7 · a · a · a = 2 · 3 · 3 · x · x · y 6ab = 2 · 3 · a · b 36s³t² = 2 · 2 · 3 · 3 · s · s · s · t · t

What Did We Learn Today?

Homework Text page 175, #16-44 multiples of 4; #48-54 evens Text page 175, #16-44 multiples of 4; #48-54 evens 24 -7 -4-5 8

Homework The “Sieve of Eratosthenes” 1) 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97; yes; these numbers only have two factors 1 and itself. 1) 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97; yes; these numbers only have two factors 1 and itself. 2) Removing multiples removes composite numbers, which leaves only primes. 2) Removing multiples removes composite numbers, which leaves only primes. 3) 10 numbers; 101, 103, 107, 109, 113, 127, 131, 137, 139, 149 3) 10 numbers; 101, 103, 107, 109, 113, 127, 131, 137, 139, 149