
Interactive Textbook

Simulation
PhET Sim: Equality Explorer
URL: https://phet.colorado.edu/en/simulation/equalityexplorer
Simulation Guide: equalityexplorerhtmlguide_en_compressed
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
This resource is aligned with Year 11/Form 5 Maths Curriculum:
Unit 5 Linear Inequalities
 Represent inequalities in one variable on a number line
 Solve linear inequalities
 one variable
 multiply and divide an inequality by a negative number
 Convert between verbally and algebraically stated inequalities
 Represent simple linear inequalities on a number plane
 one variable
 two variables
 Represent simultaneous inequalities on a number plane as the intersection of their half planes
All simulations available at http://phet.colorado.edu are open educational resources available under the Creative Commons Attribution license (CCBY).
Permission is granted to freely use, share, or redistribute PhET sims under the CCBY license.
Attribution: PhET Interactive Simulations
University of Colorado Boulder
https://phet.colorado.edu