This number challenge is an opportunity to reinforce mental arithmetic and order of operations while developing systematic work habits. Students are asked to use the numbers 4, 6, 6, and 8 (exactly once each) and the four basic operations to find as many ways as they can to represent the number 24. There are over 60 different ways! The Teachers' Notes page includes suggestions for implementation, discussion questions, ideas for support, and a link to a related article, Opening Out. (cataloged separately).


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  • Education > General

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Grade 3,NSDL,Grade 4,Grade 5,Addition,Whole numbers,Express regularity,Strategies,Number concepts,Social Sciences,Arithmetic,Analyze and persevere,Division,Number and operations,Upper Elementary,Algebra,Properties of operations,Subtraction,Multiplication,Composition and decomposition of numbers,Informal Education,oai:nsdl.org:2200/20140728160903501T,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Life Science,Elementary School,Reason quantitatively,Chemistry,Operations,Mental calculation,Algebraic manipulation,Algebraic representation,Mathematics,Problem solving,Order of operations,Process skills,Education,Representation



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