With this virtual manipulative, students can explore the meaning of place value and grouping as they add and subtract decimals. Base blocks consist of individual units, longs, flats, and blocks (ten of each set for base 10). These blocks can represent negative as well as positive numbers with one to four decimal places and in five different bases. Students exchange and group the blocks as needed to solve the problem. Problems can be presented to or created by the students. All material is available in Spanish and French as well as English, including instructions for using the manipulative, information about bases and place value, and suggested questions for classroom use.


  • Mathematics > General
  • Education > General

Education Levels:

  • Grade 1
  • Grade 2
  • Grade 3
  • Grade 4
  • Grade 5
  • Grade 6
  • Grade 7
  • Grade 8
  • Grade 9
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  • Grade 11
  • Grade 12


Visualization,Grade 6,NSDL,Grade 5,Addition,Grade 8,Number concepts,Mathematics,Arithmetic,Grade 7,Process skills,Number and operations,Upper Elementary,Place value,NSDL_SetSpec_1007936,Subtraction,Informal Education,Integers,Middle School,Elementary School,Representation,Decimals,Operations,oai:nsdl.org:2200/20120114184644866T,Vocational/Professional Development Education,Education



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