Equality Explorer
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Topics
 Solving Equations
 Inequalities
 Inverse Operations
Description
Explore what it means for a mathematical statement to be balanced or unbalanced by interacting with objects on a balance. Discover the rules for keeping it balanced. Collect stars by playing the game!
Sample Learning Goals
 Solve and manipulate algebraic equations by applying properties of real numbers (in particular, the inverse properties of addition and multiplication) and properties of equality
 Solve and manipulate algebraic equations by substituting different values for a variable
 Use a balance model to solve an equation for an unknown, and justify your strategies for solving
 Solve an equation using only universal operations
Standards Alignment
Common Core  Math
Keywords
Teacher Tips
Overview of sim controls, model simplifications, and insights into student thinking ( PDF ). 
TeacherSubmitted Activities
Title  Authors  Level  Type  Subject  

Balancing Act  Michael Reynolds  MS  Guided  Mathematics  
What is Equality  David Wood  MS HS 
HW Guided Discuss Lab 
Mathematics  
Introduction to Inequalities  Marleene Buttice  MS  Guided  Mathematics  
Solving MultiStep Equations  Meenakshi Raghavan  MS  Guided  Mathematics  
Equality Explorer  6th Grade intro to solving  Trevor Gibson  MS  Guided  Mathematics  
Exploring Equations  Akili Obika  HS MS 
Guided  Mathematics 
The new HTML5 sims can run on iPads and Chromebooks, as well as PC, Mac, and Linux systems.
iPad:
iOS 11+ Safari
iPad compatible sims
Android:
Not officially supported. If you are using the HTML5 sims on Android, we recommend using the latest version of Google Chrome.
Chromebook:
Latest version of Google Chrome
The HTML5 and Flash PhET sims are supported on all Chromebooks.
Chromebook compatible sims
Windows Systems:
Microsoft Edge and Internet Explorer 11, latest version of Firefox, latest version of Google Chrome.
Macintosh Systems:
macOS 10.9.5+, Safari 9+, latest version of Chrome.
Linux Systems:
Not officially supported. Please contact phethelp@colorado.edu with troubleshooting issues.
Design Team  Thirdparty Libraries  Thanks To 


