This Sketchpad activity, which opens on Geometer's Sketchpad and on iOS with Sketchbook Explorer (cataloged separately), promotes logical reasoning skills and informally introduces the concept of sets. Student create Venn diagrams by arranging two or three different colored circles and placing given numbers in them to produce target sums. Sketchpad generates random challenges for the students, or they can create their own problems to share. The resource provides a movie with detailed instructions and downloadable PDFs: teacher notes and a student worksheet.


  • Mathematics > General
  • Education > General

Education Levels:

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  • Grade 3
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  • Grade 5
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Grade 3,Grade 6,NSDL,Grade 4,Teaching strategies,Addition,oai:nsdl.org:2200/20140728161155275T,Spatial sense,Express regularity,Representation,Number concepts,Social Sciences,Arithmetic,Analyze and persevere,Concept formation,Process skills,Number and operations,Visual representation,Grade 5,Subtraction,Life Science,Composition and decomposition of numbers,Logic and foundations,Informal Education,Whole numbers,Middle School,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Elementary School,Reason quantitatively,Chemistry,Operations,Parity,Mental calculation,Upper Elementary,General,Mathematics,Problem solving,Venn diagrams,Education,Reasoning



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