j ISSN 002 1-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 23 NUMBER 2 MARCH 1992 National Council of Teachers of Mathematics The Journal f ar R•.rearc/J ;, Mathematics Education. an official JOUrnal of the Nauonal CounCil of Teachers or Mathcmauc~. is devoted to the intcre\ls of 1eacher• of m:uhematic> and
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