• Journal for Research in Mathematics Education (1990) Vol. 21, No. 3

    ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 21 NUMBER 3 MAY 1990 National Council of Teachers of Mathematics '/The Jaurnal for Research in Mathematics Educatiion an official journal of the National CounciJ of Teachers of Mathematic~. is devoted to the interests of teacher~ of mathematics and mat