Evolutionary processes in the development of errors in subtraction algorithms

Ricardo López Fernández and Ana B. Sánchez García*

¹University of Salamanca, Department of Didactics of Mathematics, Paseo de Canalejas, 169. Facultad de Education, Salamanca, 37008. Spain. Teléfono: +34 923294630 (ext. 3469), Fax: +34 923294635.

²University of Salamanca, Department of Didactics, Organization and Research Methods, Paseo de Canalejas, 169.Edificio Solís, 1ª plant. Salamanca. 37008. Spain Teléfono: +34 923294630 (ext. 3406), Fax: +34 923294635.