FacToring

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# FacToring - PowerPoint PPT Presentation

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

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Presentation Transcript

### 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?
• Composite numbers are numbers with more than two factors. (Not including 1.)
• Example: 12
• 12 factors into 2, 2 and 3.
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:

What numbers go into 48?

1 and 48

2 and 24

3 and 16

4 and 12

6 and 8

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 example:

Do any of these numbers need to be factored further?

An example:

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

Solution
• This example showed us that 48 has 5 prime factors:
• 2
• 3
• 2
• 2
• 2