Factors of Composite Numbers

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Grade Level

• Middle School

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Subject

• Mathematics

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Length of Time

• 45 Minutes To 1 Hour

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Description

• This lesson is on factors of composite numbers. Students will write the factors of different numbers.

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Goals

• Students will learn:
  
  * About factors
  
  * To identify the factors of composite numbers
  
  

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Materials Needed

• * You will need the worksheet that I have provided in this lesson.
  
  * Pencils and Erasers
  

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Procedure

• First, you will copy the worksheet I have included in this lesson. Then, you will explain what a factor is and show the students factors of a composite number before they do the worksheet.
  
  A composite number has more than two factors.
  
  Example: 18 is a composite number.
  
  1 x 18 = 18
  
  3 x 6 = 18
  
  The factors of 18 = 1, 3, 6, and 18.
  
  After you have gone over some examples of factors of composite numbers, then you can pass out the worksheet.
  
  
  
  
  Worksheet: Factors of Composite Numbers.
  
  Directions: Write the factors of each composite number.
  
  1. 16 =
  
  2. 24 =
  
  3. 35 =
  
  4. 42 =
  
  5. 50 =
  
  6. 100 =
  
  7. 63 =
  
  8. 45 =
  
  9. 22 =
  
  10. 21 =
  
  11. 12 =
  
  12. 32 =
  
  13. 8 =
  
  14. 54 =
  
  15. 48 =
  
  16. 72 =
  
  17. 81 =
  
  18. 36 =
  
  19. 75 =
  
  20. 49 =
  
  
  
  
  Answers to Worksheet
  
  1. 16 = 1, 2, 4, 8, 16
  
  2. 24 = 1, 2, 4, 6, 12, 24
  
  3. 35 = 1, 5, 7, 35
  
  4. 42 = 1, 2, 6, 7, 21, 42
  
  5. 50 = 1, 2, 25, 50
  
  6. 100 = 1, 2, 4, 5, 10, 20, 25, 50, 100
  
  7. 63 = 1, 7, 9, 63
  
  8. 45 = 1, 5, 9, 45
  
  9. 22 = 1, 11, 22
  
  10. 21 = 1, 3, 7, 21
  
  11. 12 = 1, 2, 3, 4, 6, 12
  
  12. 32 = 1, 2, 4, 8, 16, 32
  
  13. 8 = 1, 2, 4, 8
  
  14. 54 = 1, 2, 6. 9, 27, 54
  
  15. 48 = 1, 2, 3, 6, 8, 16, 24, 48
  
  16. 72 = 1, 2, 8, 9, 36, 72
  
  17. 81 = 1, 9, 81
  
  18. 36 = 1, 2, 3, 4, 6, 9, 12, 18, 36
  
  19. 75 = 1, 3, 5, 15, 25, 75
  
  20. 49 = 1, 7, 49
  
  
  
  
  
  

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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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