This problem challenges children to make sense of information presented by applying their knowledge of number properties and to make and test conjectures based on that information. Students try to determine the secret number property or rule by examining the numbers that fit the rule and the numbers that don't fit the rule. The Teachers' Notes page offers rationale, suggestions for implementation, discussion questions, ideas for extension and support and a link to an interactivity of the game.


  • 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


oai:nsdl.org:2200/20140728160807405T,Grade 3,NSDL,Grade 4,Grade 5,Express regularity,Reason quantitatively,Number concepts,Social Sciences,Arithmetic,Analyze and persevere,Process skills,Number and operations,Inductive reasoning,Mathematical language,Life Science,Composition and decomposition of numbers,Logic and foundations,Informal Education,Whole numbers,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Comparison of numbers,Practice Standards,Elementary School,Strategies,Chemistry,Parity,Mental calculation,Upper Elementary,Number sense,General,Mathematics,Problem solving,Communication,Education,Construct arguments,Reasoning



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