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Show the class two methods to solve proportions of fractions. The instructor shows that complex proportions can be solved by the normal method of cross-multiplying. It also shows another method where the complex fractions are simplified before solving the proportion from there.
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Concepts
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Instructional Ideas
- Lead a discussion on what it means when numbers cancel during fraction multiplication
- Let pupils share if they see another way they can solve these proportions
Classroom Considerations
- The class should be familiar with multiplying and dividing fractions
- This video is hosted on YouTube
Pros
- Compares the process to the process used in solving simple proportions
- Shows every step in the procedure
Cons
- None