• Journal for Research in Mathematics Education (1989) Vol. 20, No. 5

    ISSN 0021-8251 JOURNAL FOR RESEARCH IN \1ATHEMATICS EDUCATION VOLUME 20 NUMBER 5 NOVEMBER 1989 National Council of Teachers of Mathematics The Journal for Reuarch in Mathematics Educatiion an official joumaJ of the National Council of Teacben of Mathematics, is devoted to the interests of teachers of mathematics and ma