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Build a Fraction


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PhET Interactive Simulations
University of Colorado Boulder


  • Fractions
  • Equivalent Fractions
  • Mixed Numbers


Build fractions from shapes and numbers to earn stars in this fractions game or explore in the Fractions Lab. Challenge yourself on any level you like. Try to collect lots of stars!

Sample Learning Goals

  • Build equivalent fractions using numbers and pictures
  • Compare fractions using numbers and patterns
  • Recognize equivalent simplified and unsimplified fractions
  • Note: Build A Fraction expands on ideas from the Fraction Intro and Fraction Matcher sims or can be used as a stand-alone tool
Version 1.02