Arithmetic Teacher (1967) Vol. 14, No. 7

  • Arithmetic Teacher (1967) Vol. 14, No. 7

    THE ARITHMETIC TEACHER Volume 14, number 7 Physical representations for signed-number operations A number pencil Manipulating points and figures in space A comparison of three stratagems for teaching mathematical concepts and generalizations by guided discovery NOVEMBER 1967 Robert B. Ashlock and Tommie A. West David M