Mathematics Teacher (1926) Vol. 19, No. 2

  • Mathematics Teacher (1926) Vol. 19, No. 2

    THE MATHEMATICS TEACHER VOLUME XIX FEBRUARY, 1926 NUl\'lBER 2 A STUDY OF 'l'HE EFFECT OF CHECKING UPON ACCURACY IN ADDI'riON JOHN R. CLARK and E. LEONA VINCENT Purpose: The purpose of this investigation was to determi11e the effect, of twenty days of practice in checking in single column addition, upon speed and accura