Subtract Fractions and Mixed Numbers By Decomposing

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In the last of a five-part series, learn a final strategy for subtracting fractions and mixed numbers: decomposing. The term equivalent is reviewed to start, along with the concept of breaking up a whole number into a mixed number. Then, several problems are walked through using a combination of fraction bars and graphics to visualize the steps for solving. 

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CCSS: Designed
Classroom Considerations

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Pros

  • A yummy illustration of a problem with cookies helps reveal the common mistake of subtracting the whole of a mixed number but forgetting to subtract the fraction
Cons

  • The video discusses what equivalent means and lists fractions that are equivalent, but it does not discuss what makes one fraction equal to another
  • The term decompose is not explicitly defined, so this may be something the class should review before watching
Common Core