• Journal for Research in Mathematics Education (1991) Vol. 22, No. 5

    ISSN 002 I -8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 22 NUMBER 5 NOVEMBER 1991 National Council of Teachers of Mathematics The /tmmolfor Research ;, Matltemolics dt~colinfl, !Ill official JOurnal of the National Coundl of Tcuchers uf Mntbemaucs, ts devoted to the imerest• ul teacher• uf mnthematks and