On the Download

Seventh Grade Poster Problem
Expressions and Equations

When you download movies, games, or other items with a large amount of data to your phone, the download process may take a long time to finish. But how long, exactly? This problem uses cell phone download speeds as a context for setting up and solving linear equations. The mathematical goals are to solve equations for a specific value and to represent a delayed start time meaningfully.

Learning Objectives:

  • Represent proportional relationships in equations and identify/compare constants of proportionality.
  • Consider the effect of a delayed start time and represent it meaningfully in tables and graphs.
  • Connect the language of a word problem or situation to an equation in the form of
  • px + q = r and p(x + q) = r.
  • Explore a situation that relates to a system of equations.

Common Core State Standards for Mathematics:

The Lesson Plan:

Project funding provided by The William and Flora Hewlett Foundation and S.D. Bechtel Jr. Foundation.

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