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
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