This Nim-like interactive Flash game provides an opportunity to practice basic addition and subtraction while developing strategic thinking through generalization and by applying knowledge of factors and multiples. It can be played against the computer or a friend. Players take turns adding a whole number from 1 to 4 to a running total. The player who hits the target of 23 wins. Computer settings allow changing the target number, the range of numbers to add, who goes first, and whether the player reading the target wins or loses. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for support, and links to related games.


  • Mathematics > General
  • Education > General

Education Levels:

  • Grade 1
  • Grade 2
  • Grade 3
  • Grade 4
  • Grade 5
  • Grade 6
  • Grade 7
  • Grade 8
  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


Grade 2,Grade 3,Grade 1,NSDL,Grade 4,Factors,Addition,Early Elementary,Strategies,Number concepts,Social Sciences,Arithmetic,Analyze and persevere,Process skills,Number and operations,Upper Elementary,Mathematical language,Grade 5,Critical thinking,Subtraction,Multiplication,Composition and decomposition of numbers,Informal Education,Whole numbers,Practice Standards,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Comparison of numbers,Reason abstractly,oai:nsdl.org:2200/20140728160748637T,Life Science,Elementary School,Reason quantitatively,Chemistry,Operations,Mental calculation,Communication,Mathematics,Connections,Problem solving,Education,Construct arguments,Reasoning



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