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Solving addition and subtraction word problems. (Los problemas aritméticos de estructura aditiva de dos operaciones.) (Spanish)
Epsilon (Puerto Real) 18, No. 54, 393-413 (2002).
Classification: F90
1
Mastery of numeration at the end of each of the cycles of primary education. (El dominio de la numeración al terminar cada uno de los ciclos de la Educación Primaria.) (Spanish)
Números, No. 31, 15-31 (1997).
Classification: F32
2
Difficulties in the learning of numeration systems at primary level. (Las dificultades del aprendizaje de la numeracion en la educacion primaria.) (Spanish)
Epsilon (Puerto Real), No. 35, 179-192 (1996).
Classification: F32
3
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