PRIME AND COMPOSITE NUMBERS.ppt
- 2. Let’s watch!
- 3. Let’s Define: •Product – An answer to a multiplication problem. 7 x 8 = 56 Product
- 4. •Factor – a number that is multiplied by another to give a product. 7 x 8 = 56 Factors Let’s Define:
- 5. •Factor – a number that divides evenly into another number. 56 ÷ 8 = 7 Factors Let’s Define:
- 6. Test yourself… What are the factors and products? 1) 6 x 7 = 42 2) 63 ÷ 9 = 7 3) 8 x 5 = 40 Factors: 6 and 7 Product: 42 Factors: 7 and 9 Product: 63 Factors: 5 and 8 Product: 40
- 8. Example: 7 is prime because the only numbers that will divide into it evenly are 1 and 7. •Prime Number – a number that has only two factors, itself and 1. Let’s Define:
- 9. Examples of Prime Numbers 2, 3, 5, 7, 11, 13, 17 19, 23, 29, 31, 37…
- 10. Example: The number 8. The factors of 8 are 1, 2, 4, 8. •Composite number – a number that has more than two factors. Let’s Define:
- 11. Examples of Composite Numbers 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, …
- 12. One is special because . . . One is not prime. (because it does not have exactly two different factors). One is not Composite. (because it does not have more than 2 factors).
- 13. One is special because . . .
- 14. Summary • One and Zero are neither prime nor composite. • Two is the only even prime number. • Not all odd numbers are prime. (examples: 9, 15, 21, 27, 33, 35, …) • All composite numbers can be written as product of prime numbers.
- 15. LET’S TRY!
- 17. Prime or Composite? 1 Neither prime nor composite
- 25. Let’s have some more exercises!
- 30. The End