1. Identify if numbers are prime or composite. Sort whole numbers (through 50) into sets containing only prime or only composite numbers

2. All numbers can be divided by themselves and by one.

3. Prime Numbers Prime numbers can ONLY be divided by themselves and by one. 13 Groups of 1 1 Group of 13 OR 13 can ONLY be divided by 13 or by 1.

4. 15 can be divided by 5 or 3, as well as by 15 or 1: 3 groups of 5 OR 5 groups of 3 1 group of 15 OR 15 groups of 1 Composite Numbers can be divided by something else, also.

5. TIP: The easiest way to find out if a number is prime or composite is to run through a list of possible divisors. Can I divide by 2? ALL even numbers can be divided by 2. Can I divide by 3? Add all the digits together, if the SUM of the digits can be divided by 3, then the number itself can be divided by 3. Can I divide by 5?ALL numbers ending with 0 or 5, can be divided by 5.

6. Which numbers are prime? 2015113 171989 2125713

7. 2015113 171989 2125713 Prime Numbers are:

8. Which are composite numbers? 3211510 12272319 261418

9. Composite numbers are: 3211510 12272319 261418

10. Music will play and numbers will be stated. If the number is composite, keep walking. If the number is prime, sit down in the closest chair (start walking again, only when you hear a composite number again). Stand up, push in chair, and get ready to start when the music begins. NO TALKING DURING GAME!!!!

11. Go around room, start counting (person by person), if your number is composite say it, if it is prime say BUZZ. Try to keep it going to 50. Repeat and see if the class can do it faster.