In this activity, students explore number decomposition and the powers of two. They play a number guessing game, and by the presence or absence of the secret number on each of six cards, the number can be found. An applet has the computer play the trick with the learner. The Teachers' Notes page offers rationale, suggestions for implementation, discussion questions, and ideas for support and extension.
Keywords:Make use of structure,NSDL,Grade 5,Addition,Geometric sequence,Mathematics,Exponents,Arithmetic,Analyze and persevere,Concept formation,oai:nsdl.org:2200/20140728160758780T,Number and operations,Upper Elementary,Algebra,Social Sciences,Multiplication,Composition and decomposition of numbers,Patterns and sequences,Informal Education,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-027,Practice Standards,Deductive reasoning,Life Science,Elementary School,Algorithms,Reason quantitatively,Algebraic thinking,Chemistry,Computing and Information,Operations,Mental calculation,Communication,Mathematical language,Connections,Engineering,Process skills,Education,Reasoning