00641nam a22002297i 4500 20141212085904.0 870915s1987 sp gr 000 0 spa c eng FUSON, K. ROLES OF REPRESENTATION AND VERBALIZATION IN THE TEACHING OF MULTI-DIGIT ADDITION AND SUBSTRACTION Matemáticas Método educativo Problemas de cálculo Documental EUROPEAN JOURNAL OF PSYCHOLOGY OF EDUCATION Vol. 1, no. 2 (1986), p. 35-56 75 C11c C3 AR 19870915 R.728 Depósito (94) AR