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Prime and Composite Numbers

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Prime and Composite Numbers

GLE 0406.2.3 Identify prime and composite numbers.

Standard Addressed:

GLE 0406.2.3 Identify prime and composite numbers.

But…. What are Prime and Composite Numbers?

- Prime Numbers- A whole number greater than 1 that has exactly two factors, 1 and itself.
- Composite Numbers- A whole number greater than 1 that has more than two factors.
Look @ these Numbers Factors

- 21, 2
- 31, 3
- 41, 2, 4
- 51, 5
- 61, 2, 3, 6

- Brain Pop
- http://www.brainpop.com/math/numbersandoperations/primenumbers/quiz/

Items in use: Connecting cubes and white boards

Show me the ways one could arrange the connecting cubes (arrays) for the number 4 ? Then, write all the possible factors for this number on the whiteboards. Classify prime or composite. Why?

- numbers 1-10

We are Greek Mathematicians and we are on the hunt for prime numbers!

Instructions:

- put a triangle around the number that is neither prime nor composite,
- circle the Prime Numbers
- mark out the Composite Numbers 1-100.
- *There are 25 prime number in total between 1-100.

Card Sort

- Composite vs. Prime
- Why do you belong there?
- Hand Transition Activity

Math Games: Prime and Composite Numbers- Fruit Shoot

Tic Tac Toe Game…Lets take a look

- Partners of 2 (neighbor)
- Two sided (7-8 minutes a side)
- Foam squares and dice
- May use 100’s chart as guide
- Review Instructions before start!

- How are composite numbers and prime numbers different?
- Give an example of an odd number that is composite?(whiteboards)
- What is the only even prime number? (whiteboards)
- Roger has 47 cars. Can he group them more than two ways?
- Why is 1 neither prime nor composite?
- What’s another way in math that we could use prime and composite numbers other that just identifying and classifying them.

- Kyle has 17 toy trucks. How many ways can the trucks be placed in equal groups?
- 5 ways
- 2 ways
- 3 ways
- Marla says that every number in the nineties is composite. Jackie says that one number in the nineties is prime. Who is correct? Explain.

- What was the main goal for today’s learning?
- Students will be able to……

- Exit Ticket

- http://mathforum.org/library/drmath/view/57182.html