Activity Database

Activity Authors
Activity Circles
Click To Sort By
  • 6th - 8th (1)
  • 9th - 12th (1)
  • College Level (1)
  • For Teachers (1)
  • Problem Solving / General (1)
  • Algebra / Arithmetic (1)
  • Combinatorics (1)
  • Mathematical Games (1)
Supporting Materials
Supporting Materials
  • Facilitator Guides (1)
Session Styles
Session Styles
  • Work Backwards (1)
  • Multiple Representations (1)
  • Problem Sets (1)
  • Try a Smaller Problem (1)
Mathematical Practices
Mathematical Practices
  • MP1 - Make sense of problems and persevere in solving them. (1)
  • MP5 - Use appropriate tools strategically. (1)
  • MP6 - Attend to precision. (1)
  • MP7 - Look for and make use of structure. (1)



Developed as part of the Math Circles of Inquiry project, this module has students grapple with different representations of percents in various contexts in order to solve real life problems. Students need fluency in percentages for real world applications such as shopping, eating at restaurants, commission based careers, etc. Understanding percent expressions in seventh grade is necessary to be able to create exponential functions in Algebra 1.

This module contains twelve activities to address the various fine points associated with percent standards.

Systems of Linear Equations


Developed as part of the Math Circles of Inquiry project, this short module explores a graphical solution to a system of equations. Students answer questions about lemonade sales and physically stand on the coordinates of a giant grid in order to see that plotting two equations on the same set of axes can give useful information. They will also gain experience in linear equation formats other than slope-intercept form and explore what the intersection points of the lines in a system of equations means.