• Journal for Research in Mathematics Education (1990) Vol. 21, No. 1

    ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION VOLUME 21 NUMBER 1 JANUARY 1990 National Council of Teachers of Mathematics The Journal for Research in Mathematics Educa lion, an official joumal of the Natio nal ~ouncil of Teachers of Mathematics. is devoted to the mtcrests of teachers of mathematics and m