The objective of this study is to present aspects that give life to an object of knowing mathematical school in an educational institution. Unveils the issue of socio-cultural practices of mathematical knowledge objects. Is part of the Research Program in Teaching of Mathematics of the Mathematics Institute of Education and Scientific / UFPA. Uses conceptual contributions of Anthropological Theory of Didactic (TAD) and Ethnomatematics. Brings to the arena of education, some perceptions of theoretical and practical correlations between Mathematics Education and Rural Education. Suggests understandings of mapping cultural practices and discourses House School of Fisheries (CEPE) as instrumentation for understanding institutional resistance in relation to what makes us and subject us. It presents evidence of some historical, epistemological, political and pedagogical of the Rural Education of perspective, from the perspective of Ethnomatematics and TAD. Analyzes levels of co didactic determining the ecology of an object of mathematical knowledge in the educational system of CEPE, in light of the TAD. It features the use of teaching tasks in mathematics study process and its conditions and restrictions, the praxeological organizations that give life to know mathematical objects. It assumes that the educational practices in CEPE move mathematical objects, for example, to Unit Reduction Method (MRU) to resolve situations on the fishing activity. Considers a hypothesis that there is an institutional stake in CEPE, mobilizing discourses and practices that affect the life of knowledge objects in meeting the needs of individuals in their social practices of the field. Advocating as the MRU happens, as it emerges, where practices and under what conditions, comes to the thesis that there are practices with Mathematics at CEPE, involving the MRU for situations solution on production and marketing of fisheries and aquaculture; whose life is sustained by the functionality and use of it is done in the activities as a reality of life for school students; necessarily activating the use of praxeological tasks imposed by the political and pedagogical dimensions. However, these They print the subject ways of thinking and acting making these practices once structured, become internalized, legitimated, rooted reproduced and perpetuated institutionally. Weaves understanding that Social Practice with Math can constitute an important approach and necessary to uncover, outline and possibly understand relationships and influences of mutual and institutional forces in the operation or not mathematical knowledge objects in different levels of co-determination in social practices of Etnocomunidades such as CEPE school.
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