In this interactive Flash version of the familiar game Concentration ("pelmanism" in the UK) a single user practices finding equivalent forms of fractions, decimals and percents, while developing memory and focusing skills. The player can choose an array of 16, 20, or 24 cards, which appear face down. The goal is to flip two cards at a time to match all pairs of equivalent values as efficiently as possible. A scoring feature discourages random guessing. Printable versions of the game cards are available to download. The Teachers' Notes page offers suggestions for implementation, discussion questions, and ideas for support.


  • Mathematics > General
  • Education > General

Education Levels:

  • Grade 1
  • Grade 2
  • Grade 3
  • Grade 4
  • Grade 5
  • Grade 6
  • Grade 7
  • Grade 8
  • Grade 9
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  • Grade 11
  • Grade 12


Fractions,Process skills,Mental calculation,Number and operations,Middle School,NSDL,Upper Elementary,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Grade 4,Grade 5,Percent,Grade 6,Connections,Elementary School,oai:nsdl.org:2200/20140728161132698T,Informal Education,Mathematics,Education,Decimals,Social Sciences,Arithmetic



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