This web site contains information and interactive applets related to our Hindu-Arabic number system. Users learn the history and structure of the system as well as how to count and write numbers. Users can learn and practice various algorithms for whole number computation and explore fractions, decimals and percents in our number system. The site explains various sets of numbers and how they relate to operations.


  • Social Studies > General
  • Mathematics > General
  • Education > General

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Grade 2,Grade 3,Grade 1,Make use of structure,NSDL,Grade 4,Grade 5,Percent,Early Elementary,Mathematics,Informal Education,Number concepts,Social Sciences,Arithmetic,Concept formation,Division,Number and operations,Upper Elementary,Rational numbers,Place value,Attend to precision,Engineering,Properties of operations,Model with mathematics,Mathematics history,Multiplication,Subtraction,History/Policy/Law,Integers,Whole numbers,Use appropriate tools,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Life Science,Elementary School,Algorithms,Social Studies,Reason quantitatively,Real numbers,Complex numbers,Computing and Information,Operations,Mental calculation,Prime numbers,Connections,Early number systems,Vocational/Professional Development Education,Irrational numbers,oai:nsdl.org:2200/20140728161216721T,Process skills,Education,Roots



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