All that work put into prime factorizations won't go to waste. An illuminating video describes how to determine the least common multiple and greatest common factor of two numbers using the prime factorizations. Learners see how to use a Venn diagram to classify each factor as being common to the two numbers or not, and then use the factors to find the least common multiple and greatest common factor.

Concepts

least common multiple, greatest common factor, prime factors

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Additional Tags

math

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Instructional Ideas

• Give the video to learners struggling with the concept
  

Classroom Considerations

• Pupils should be familiar with Venn diagrams
  
• Some vocabulary terms used in the video, such as lowest common multiple and highest common factor, are different from those typically used in US classrooms
  

Pros

• Includes a worksheet with practice questions and additional textbook exercises
• Provides a separate file with an answer key
  

Cons

• None

Common Core

6.NS.B.4