Lecture-Based: Common Denominator

Resource for Grades 9-12
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Lecture-Based: Common Denominator

Media Type:
Video

Running Time: 4m 07s
Size: 3.8 MB

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KET

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A common denominator is needed when adding fractions with differing denominators. The pre-algebra concept of combining like terms is briefly noted.

These resources are part of KET's Math Instructional Strategies: Number Operations collection.

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Students may sometimes be unsure when adding or subtracting fractions with differing denominators. In this situation, the idiomatic expression, "You can't add apples to oranges" may come to mind. Finding a common denominator is the solution when adding or subtracting fractions with differing denominators. The concept of like terms can be glimpsed as a result of finding the common denominator.

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open Discussion Questions

  • Describe ways that visual representations (the pizzas on the board, etc.) can be effective. Are there times that this type of representation is ineffective? Explain.
  • In your opinion, which was the more effective visualization in this video: the pizzas on the board or the writing utensils example? Why?
  • The multiplicative identity states that the product of any number and 1 is the number itself. Is this explicit or inferred in this lesson? Would you point it out? Why or why not?
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