This mobile app (available for both iOS and Android devices) was developed by the National Council of Teachers of Mathematics with funding from Verizon Foundation. The app is based on the Decimal Maze from the popular lesson "Too Big or Too Small". The goal is to help Okta reach the target (maximum, minimum, or a specific value) by choosing a path from the top of the maze to the bottom — adding, subtracting, multiplying and dividing as the player goes. Seven levels with seven puzzles in each level test the player's skills with operation with powers of ten, negative numbers, fractions, decimals, and exponents.


  • 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


Visualization,Grade 6,NSDL,Grade 4,Factors,Addition,Upper Elementary,Mathematics,Number concepts,Equivalent fractions,Arithmetic,Analyze and persevere,Fractions,Division,Number and operations,Chemistry,Algebra,Rational numbers,Place value,Grade 5,Exponents,Properties of operations,Subtraction,Multiplication,Composition and decomposition of numbers,Informal Education,Whole numbers,Middle School,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Comparison of numbers,Practice Standards,Life Science,Elementary School,Social Sciences,English,Reason quantitatively,Algebraic thinking,Estimation,Decimals,Operations,Systems of measurement,Algebraic manipulation,Number sense,Metric,Connections,Grade 3,Problem solving,Measurement,Process skills,Education,Reasoning,oai:nsdl.org:2200/20140728161006774T



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