Factors, Multiples, Prime and Composite Numbers
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This document discusses factors, multiples, prime numbers, and composite numbers. It provides examples of finding the factors and multiples of numbers like 3, 6, 12, and 18. It explains that numbers with only two factors, 1 and itself, are prime numbers, while numbers with more than two factors are composite numbers. Examples of prime numbers given are 7, 11, 13, 17, while 15, 24, 36 are identified as composite numbers.
Factors, Multiples, Prime and Composite Numbers
- 1. • 8X1= • 8X2= • 8X3= • 8X4= • 8X5= • 8X6= • 8X7= • 8X8= • 8X9= • 8X10=
- 3. PEMDAS • Parenthesis first, Exponent, Multiplication, Division, Addition, Subtraction
- 7. What numbers should be multiplied to get
- 9. Thus, 1,2,3,6,9 and 18 are factors of 18. Let us try multiplying 3 by 1 to 7. 3x1 =3 3x5 =15 3x2 =6 3x6 = 18 3x3 =9 3x7 = 21 3x4 = 12 3,6,9,12,15,18,and 21 are multiples of 3. They are all divisible by 3.
- 10. Let us have another example. Find the multiples of 6. 6x1 = 6x2 = 6x3 = 6x4 = 6x5 =
- 11. Therefore 6,12,18,24,and 30 are multiples of 6. Look at the previous examples. How many factors does 12 have? How about 18? If a number has more than 2 factors, it is a composite number. Can you give other composite numbers?
- 12. Look at the factors of the following. 7= 1x7 29= 1x29 11= 1x11 31= 1x31 13= 1x13 59= 1x 59 17= 1x 17 What can you say about the numbers above? They have exactly 2 factors, 1 and itself. Those numbers are called prime numbers. Can you give other prime numbers?
- 13. Remember _________ are the numbers we multiply to get a product. When a number is multiplied by 1,2,3, and so on, the products are called the ________ of that number. _________ numbers are numbers with more than two factors. _________numbers are numbers that have only two factors, 1 and itself.
- 14. Exercises: Give all the factors of each. 1. 24= ________________________ 2. 36=_________________________ 3. 48=_________________________ 4. 72=_________________________ 5. 80=_________________________
- 15. Answer 1. 24= 1,2,3,4,6,8,12,24 2. 36= 1, 2, 3, 4, 6, 9, 12, 18, 36 3. 48= 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 4. 72= 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 5. 80= 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
- 16. Evaluation Write P if the number is prime and C if the number is composite. 1. 11=___P______ 2. 13=___P______ 3. 15=____C_____ 4. 17=_____P____ 5. 21=______C___
- 17. Write Y if the number is multiple of the second and N if it is not. 1. 27,9=___Y____ 2. 42,21=___Y___ 3. 72,16=____N__ 4. 72,6=______Y_ 5. 121,11=_____Y
- 18. Assignment: Identify if it is prime or composite. 1. 22=_________________ 2. 23=__________________ 3. 24=__________________ 4. 63=__________________ 5. 81=__________________
- 19. THANK YOU!