This game for two players provides students with practice in whole number addition and subtraction while developing strategic thinking. It is played on paper on a 0-20 number line. Player 1 crosses off two numbers and circles either their sum or difference. In each successive turn players cross off the last circled number and one of their choice, and then circle the sum or difference. The player who makes the last possible move wins. The game also may be played co-operatively. The Teachers' Notes page offers suggestions for introducing the game, discussion questions, and extension ideas.


  • 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,Grade 5,Addition,Early Elementary,Number concepts,Mathematics,Social Sciences,Arithmetic,Analyze and persevere,Process skills,Number and operations,Upper Elementary,Mathematical language,Critical thinking,Subtraction,Informal Education,Whole numbers,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Elementary School,Reason quantitatively,Operations,Mental calculation,Communication,oai:nsdl.org:2200/20140728160653504T,Education,Construct arguments,Reasoning



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