ISSN 0021-8251 JOURNAL FO RESEARC MATHEMATICS COUNCIL OF TEACHERS OF MATHEMATICS VOLUME 25 NUMBER 5 NOVEMBER 1994 The Joumalfor Rtuorch i11 MathtmaticJ ducotio11, an otficral JOUrnal of the Nnhonal Council of T~ach<!rs of Mathe matics, b devot~d lo the rntcrcsts of t~achers of mathematic.~ and mathematics educauon at n
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