From this perspective, it is presented in the first place a brief summary of the
contributions of the research in mathematics education and educational psychology child about learning the number
in the first ages; secondly, the approach of the NCTM (2000) with regard to the mathematical knowledge, which
considers five standards of content and five standard processes; and finally, the description of the process of
validation of an instrument for assessing the presence of the mathematical processes in the practices of teaching and
learning of the notion of number in early childhood education