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. 

Concepts

unit rates, cost, cost analysis

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Additional Tags

math

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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

Common Core

6.RP.A.2