This virtual manipulative challenges students to solve number puzzles using one- and two-digit addition. Each puzzle requires students to arrange a given set of numbers on either a triangular or square grid so that sides or the rows, columns, and diagonals add up to a given number. Students are able to check their answers on the web site, which includes instructions for using the applet, a description of related activities, and information for parents and teachers. There is also a link to the National Council of Teachers of Mathematics (NCTM) Standard for Number and Operations. Copyright 2005 Eisenhower National Clearinghouse


  • 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


Grade 6,NSDL,Grade 5,Addition,Grade 8,Grade 9,Mathematics,Arithmetic,Grade 7,Process skills,Number and operations,Upper Elementary,NSDL_SetSpec_1007936,Grade 10,Informal Education,Middle School,Elementary School,Operations,High School,Problem solving,oai:nsdl.org:2200/20120114184712849T,Education



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