Instructional Video

Real World Problems That Involve Rates, Proportions and Percents

In a STEM-focused curriculum, units and conversions are front and center in the accuracy and reasonableness checks. This approachable presentation breaks down both the why and the how of converting units, and then applies the conversion methods to word problems. A particular emphasis on making sure results both answer the question and are reported to a reasonable degree of accuracy makes this an excellent and well-rounded presentation.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Link with the science curriculum when unit conversions are covered
  • Have the class do a short research project on famous unit conversion errors in history
  • Link this video on the classroom website for pre-class viewing in the flipped classroom model or for on-demand homework help in the traditional setting
  • Create a memory game where matched pairs are equivalent quantities in different units
Classroom Considerations
  • Video viewing requires Internet access
  • The numerator and denominator of ratios are converted separately, then divided. Consider this method for remediation if learners struggle with converting both quantities in the same series of unit rates
  • Try pausing the video throughout the problems to allow time for questions and learner work
  • This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information
Pros
  • Easily understood and pleasant narration
  • Careful treatment of each step in a conversion
  • Emphasis on meaningful and reasonable answers
  • Both single- and multi-step conversions demonstrated
Cons
  • No printable note slides available
  • No corresponding independent work problems provided
Common Core