2.  Please go through this PowerPoint, you may print it and highlight important ideas, or take notes  At the very end of the slide there are some questions for you to try. You must bring those completed for next class

3.  A multiple is formed by multiplying a given number by the counting numbers.  The counting numbers are 1, 2, 3, 4, 5, 6, etc.

4.  4 x 1 = 4  4 x 2 = 8  4 x 3 = 12  4 x 4 = 16  4 x 5 = 20  4 x 6 = 24 Counting Numbers So, the multiples of 4 are 4, 8, 12, 16, 20, 24, 28, etc.

5. 13 x 1 =13 13 x 2 = 26 13 x 3 = 39 13 x 4 = 52 13 x 5 = 65 13, 26, 39, 52, 65

6.  6, 12, 18, ____, ____  ___, 6, 9, 12, ____, ____, 21  ___, 24, 36, 48, 60, ____ 2430 31518 12 72

7.  Factors are the numbers you multiply together to get a product.  For example, the product 24 has several factors.  24 = 1 x 24  24 = 2 x 12  24 = 3 x 8  24 = 4 x 6  SO, the factors are 1, 2, 3, 4, 6, 8, 12, 24

8.  Start with 1 x the number.  Try 2, 3, 4, etc.  When you repeat your factors, cross out the repeat - you’re done at this point.  If you get doubles (such as 4 x 4), then you’re done. Repeats or doubles let you know you’re done.

9. 1 x 16 2 x 8 3 x ?? 3 is not a factor, so cross it out 4 x 4 doubles = done The factors of 16 are 1,2,4,8,16

10. 1 x 18 2 x 9 3 x 6 4 x ?? 5 x ?? 6 x 3 Repeat! Cross it out! We’re done! The factors are 1,2,3,6,9,18

11. 1 x 7 2 x ?? 3 x ?? 4 x ?? 5 x ?? 6 x ?? 7 x 1 This works, but it is a repeat. We are done. The only factors of 7 are 1,7

12. Prime numbers are numbers that only have two factors: one, and the number itself. EXAMPLES: 3, 5, 7, 11, 31 Composite numbers have more than two factors. EXAMPLES: 6, 18, 30, 100

13. 1. List the factors of 11,16 and 24. Are they prime or composite numbers? 2. What is the greatest common factor of 16 and 24? 3. Find the LCM of 8 and 9. 4. What would the 20 th multiple of 7 be?