ISSN 0021 -8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 27 NUMBER 2 MARCH 1996 National Council of Teachers of Mathematics The Joumolfor R~seorch in Mathematics duration , an ofliconl JOurnal ol the NJUonal Council of T~.ochcr' of MathcmJllK'\ "deVN•'Ilto th~ ontcn:;c.; of teacher; of mathcm.oloc' Jnd math
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