childish stage, as for example the Logical Model Piagetiano (Piaget and Szeminska, 1967) or the Model of Integration of Skills (Baroody, 1998; Fuson, 1988; Bermejo, 1990), among others.
childish stage, as for example the Logical Model Piagetiano (Piaget and Szeminska, 1967) or the Model ofIntegration of Skills (Baroody, 1998; Fuson, 1988; Bermejo, 1990), among others.