ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 24 NUMBER 2 MARCH 1993 1\'ationa/C'ouncil of Teachers of llatbenzatic'S The Journal fur Ruearclt in Matltt matics l!ducatio11, an official JOUntal of the National Council of Teacher< of MnthematttC\ i' dtvoted to the mteren< of teacher; of mathematics
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