Learning About Prime and Composite Numbers

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Grade Level

• Middle School

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Subject

• Mathematics

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Length of Time

• 1 Hour

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Description

• In this lesson, students will learn about prime and composite numbers.

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Goals

• Students will learn:
  
  * About Prime Numbers
  
  * About Composite Numbers
  
  

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Materials Needed

• * The worksheet I have included in this lesson.
  
  * Pencils and Erasers
  

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Procedure

• First, you will copy the worksheet I have included in this lesson so that each student will have a copy.
  
  Then, you will explain about prime numbers and composite numbers.
  
  A prime number has only two factors. It has the number itself and number one. 47 = 1, 47
  
  A composite number has more than two factors.
  For example: 4 has 1, 2, 4 as the factors: 1 x 4 = 4 and 2 x 2 = 4.
  
  After that, you will pass out the worksheets so that the students can work on them independently.
  
  
  Worksheet - Prime and Composite Numbers
  
  Directions: Write Prime or Composite after each number.
  
  1. 17
  
  2. 24
  
  3. 35
  
  4. 19
  
  5. 2
  
  6. 7
  
  7. 18
  
  8. 29
  
  9. 31
  
  10. 42
  
  11. 46
  
  12. 50
  
  13. 9
  
  14. 16
  
  15. 44
  
  16. 47
  
  17. 33
  
  18. 75
  
  19. 85
  
  20. 27
  
  
  
  Answer Sheet
  
  1. 17 = Prime
  
  2. 24 = Composite
  
  3. 35 = Composite
  
  4. 19 = Prime
  
  5. 2 = Prime
  
  6. 7 = Prime
  
  7. 18 = Composite
  
  8. 29 = Prime
  
  9. 31 = Prime
  
  10. 42 = Composite
  
  11. 46 = Composite
  
  12. 50 = Composite
  
  13. 9 = Composite
  
  14. 16 = Composite
  
  15. 44 = Composite
  
  16. 47 = Prime
  
  17. 33 = Prime
  
  18. 75 = Composite
  
  19. 85 = Composite
  
  20. 23 = Prime
  
  

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Grading

• Each question is worth five points.
  
  100 to 90 = A
  
  89 to 80 = B
  
  79 to 70 = C
  
  69 to 60 = D
  
  Below 60 = F
  
  

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