• Journal for Research in Mathematics Education (1989) Vol. 20, No. 4

    ISSN 0021-825 1 JOURNAL FOR RESEARCH IN v1ATHEMATICS EDUCATION VOLUME 20 NUMBER 4 JULY 1989 National Council of Teachers of Mathematics TheJoumulfor Research in Mathematics Education. an official journal of the National Council of Teachers of Mathematics, is devoted to the interests of teachers of mathematics and mathe