Mathematics Teacher (1970) Vol. 63, No. 4

  • Mathematics Teacher (1970) Vol. 63, No. 4

    NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS APRIL 1970 VOLUME LXIII , NUMBER 4 On the Solution of a Problem James W. Wilson and J erry P. Becker Use of Summation Operators for the Derivation of Common Formulae Ronald L. /man A Case for Flexibility in Classroom Instruction Elaine K i vy Genkins A Construction of and Phy