This interactive Java applet helps users develop place value concepts involving subtraction of numbers with 1, 2, 3, or 4 digits. The virtual blocks are manipulated to model regrouping in order to solve whole number subtraction problems posed by the applet. Users also may create and solve their own problems with whole numbers or with up to 3 decimal places. When creating problems a user may change the default of base 10 to any of the bases 2, 3, 4, or 5.


  • Mathematics > General
  • Education > General

Education Levels:

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Grade 2,Grade 3,Grade 1,Make use of structure,NSDL,Grade 4,Grade 5,Early Elementary,Visual representation,Representation,Number concepts,Arithmetic,Concept formation,Process skills,Number and operations,Upper Elementary,Place value,Subtraction,Life Science,Composition and decomposition of numbers,Informal Education,Integers,Whole numbers,Middle School,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Elementary School,Algorithms,Reason quantitatively,Chemistry,Decimals,Computing and Information,Operations,Number sense,Mathematics,oai:nsdl.org:2200/20140728160800757T,Engineering,Education



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