• Journal for Research in Mathematics Education (1990) Vol. 21, No. 4

    ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 21 NUMBER 4 JULY 1990 National Council of Teachers of Mathematics The Joumat for Research in Mathematics Educatiion an official journal of the National Council of Teachers of Mathematics. is devoterl to the interestS of teachers of mathematics and math