text: # Is It A Prime Number, Yes or No? Jonathan Brinkerhoff.
  
  ## Presentation on theme: "Is It A Prime Number, Yes or No? Jonathan Brinkerhoff."— Presentation transcript:
  
  Is It A Prime Number, Yes or No? Jonathan Brinkerhoff
  
  There are different kinds of numbers. You know about whole numbers, like 5, and fractions like ⅓. You know about odd and even numbers. Today, we’ll learn about another kind of number – prime numbers.
  
  I’m going to show you some numbers. Some are prime and some are not. When you think you know what makes a number prime or not, raise your hand.
  
  3 is a prime number 3 = 1 X 3
  
  4 is not a prime number 4 = 1 X 4 4 = 2 X 2
  
  5 is a prime number 5 = 1 X 5
  
  6 is not a prime number 6 = 1 X 6 6 = 2 X 3
  
  7 is a prime number 7 = 1 X 7
  
  12 is not a prime number 12 = 1 X 12 12 = 2 X 6 12 = 3 X 4
  
  13 is a prime number 13 = 1 X 13
  
  15 is not a prime number 15 = 1 X 15 15 = 3 X 5
  
  What do you think a prime number is?
  
  You figured out that a prime number has only two factors, itself and 1.
  
  Let’s Practice! If it’s a prime number If it’s not a prime number
  
  8
  
  9
  
  14
  
  17
  
  21
  
  10
  
  19
  
  You can correctly identify prime numbers.
  
  2 is a prime number 2 = 1 X 2
  
  9 is not a prime number 9 = 1 X 9 9 = 3 X 3
  
  11 is a prime number 11 = 1 X 11
  
  14 is not a prime number 14 = 1 X 14 14 = 2 X 7
  
  What do you think a prime number is?
  
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