ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 27 NUMBER 1 JANUARY 1996 National Council of Teachers of Mathematics The Journal for Reuorch in Matlumatic:s EducutiOfl, an oflicioll journal of the Nattnnnl Council nf Teacher> of MathemattiC' is devoted to the tnterest.s ot tenchcrs of m:uhematic> an
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