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Extend an understanding of ratios and proportions to include unit rates. The video lesson compares two prices of different sizes using two methods. The instructor first calculates a unit price for each product and compares the costs. The second method shown uses a proportion to calculate the expected cost of a comparable size using the first cost.
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CCSS:
Adaptable
Concepts
Additional Tags
Instructional Ideas
- Ask individuals to take pictures of costs of items of different sizes at a grocery store so they can analyze them
- Use board work with practice problems modeled after the problems in the video
Classroom Considerations
- Expects proficiency with ratios, proportions, and long division
- This video is hosted on YouTube
Pros
- Provides learners with different methods of solving the same problem
- Shows all work including the long division necessary to calculate the unit prices
Cons
- Does not relate the problem to a contextual situation, which diminishes the relevance