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FacToring. Glencoe Chapter 10 Section 1- Ms. Moye. Review: . What is a prime number? Well, it’s a number that has exactly two factors: itself and one Example: 5 It’s factors are 5 and 1. Review: . Who remembers what a composite number is?

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factoring

FacToring

Glencoe Chapter 10 Section 1- Ms. Moye

review
Review:
  • What is a prime number?
    • Well, it’s a number that has exactly two factors: itself and one
    • Example: 5
      • It’s factors are 5 and 1.
review1
Review:
  • Who remembers what a composite number is?
    • Composite numbers are numbers with more than two factors. (Not including 1.)
    • Example: 12
      • 12 factors into 2, 2 and 3.
prime factorization
Prime Factorization
  • We’re going to start by learning how to express a composite number in terms of it’s prime factors.
  • My favorite method is the tree method:

8

8 = 4 * 2

4 = 2 * 2

http://thefactortree.com/2010/10/what-is-a-factor-tree/

an example
An example:

What numbers go into 48?

1 and 48

2 and 24

3 and 16

4 and 12

6 and 8

an example1
An example:

What numbers go into 8?

1 and 8, 2 and 4

What numbers go into 6?

1 and 6, 2 and 3

an example2
An example:

Do any of these numbers need to be factored further?

an example3
An example:

http://www.alleyoop.com/blog/2011/02/27/math-facts-factor-trees/

solution
Solution
  • This example showed us that 48 has 5 prime factors:
    • 2
    • 3
    • 2
    • 2
    • 2
try it on your own
Try it on your own:
  • Try factoring the number 42 on your own.
  • (Hint: Start by finding one number that you know goes into 42 and work from there)
solutions
Solutions:

http://thefactortree.com/2010/10/what-is-a-factor-tree/

congrats

CONGRATS!!

Time to finish your worksheet!