Rachel Duff

1
What is a prime number?

• Rachel Duff
• Math
• Third Grade

2
What is a prime number?

• Having no factor except itself and one
• Having exactly two factors, no more, no less
• Positive non-zero number
• Factor One of two or more quantities that
  divides a given quantity without a remainder. For
  example, 2 and 3 are factors of 6 a and b are
  factors of ab.

3
What to do next?

• Get a piece of paper and a pencil, or click on
  the blue box below for a worksheet to print out.
• You are going to go through the next 9 slides
  and tell which numbers are prime numbers and
  which are not.

4
Is this a prime number?
One 1
5
Is this a prime number?
Six 6
6
Is this a prime number?
Three 3
7
Is this a prime number?
Ten 10
8
Is this a prime number?
Eight 8
9
Is this a prime number?
Two 2
10
Is this a prime number?
Seven 7
11
Is this a prime number?
Five 5
12
Is this a prime number?
Four 4
13
How well did you do?

• Now you are going to go to the next page to see
  the correct answers.

14
Here are the correct answers!
15
Work sheetCircle the correct answer!
16
References
http//www.dictionary.com/ gave me the
definitions for a prime number and a factor.
http//www.math.com/ also gave me a definition
and allows students to put in a number and it
will tell them whether or not it is prime.