Finding the LCM

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Grade Level

• Middle School

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Subject

• Mathematics

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Length of Time

• 45 Minutes

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Description

• This lesson is on teaching the LCM (Least Common Multiple). This lesson could also be used for fourth and fifth grade students.

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Goals

• Students will learn:
  
  * About LCM
  
  * How to find the LCM
  
  

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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 so that each student will have a copy.
  
  Then, you will write an example on the board about LCM
  
  Example:
  Multiples of 6 - 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
  Multiples of 4 - 4, 8, 12, 16, 20, 24, 28, 32, 36, 40
  
  The common multiples are 12, 24, 36.
  The LCM is 12.
  
  After you have gone over the example, then you will pass out the worksheets so they can work on them independently.
  
  
  
  Worksheet - Finding the Least Common Multiple (LCM)
  
  Directions - Find the LCM of each group listed below.
  
  1. Multiples of 4 -
  Multiples of 2 -
  
  2. Multiples of 3 -
  Multiples of 6 -
  
  3. Multiples of 9 -
  Multiples of 3 -
  
  4. Multiples of 7 -
  Multiples of 5 -
  
  5. Multiples of 4 -
  Multiples of 8 -
  
  6. Multiples of 3 -
  Multiples of 5 -
  
  7. Multiples of 2 -
  Multiples of 7 -
  
  8. Multiples of 2 -
  Multiples of 6 -
  
  9. Multiples of 5 -
  Multiples of 10 -
  
  10. Multiples of 6 -
  Multiples of 4 -
  
  
  
  
  

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Grading

• Each problem is worth 10 points for a total of 100 points.
  
  100 to 90 = A
  
  89 to 80 = B
  
  79 to 70 = C
  
  69 to 60 = D
  
  Below 60 = F
  
  

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