ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 27 NUMBER 3 MAY 1996 National Council of Teachers of Mathematics The }oumal for R~scarch i11 Mathematics duration. un ollicoal JOUmul ol the Nulional Coun~1l of Tc~chcr' of Mo~rhc mJtic,, " de\otcd to the tntere't:. of tc!:ICher!> nf m.uhem.JIIc' and m
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