This research was carried out with 5th grade elementary school students from a municipal public school in the city of Rio Verde-GO and its objective was to evaluate, through a script of contextualized activities involving Mathematics, the development of Environmental Education, verifying the contributions of these activities to the formation of the ecological subject of a 5th grade elementary school student, in order to answer what contributions contextualized Mathematics activities interconnected with Environmental Education lead 5th grade elementary school students to form themselves as ecological subjects. The research consisted of the construction of 7 contextualized activities, based on the theories of Leff (2002, 2006, 2010), Carlos Loureiro (2012), Isabel Carvalho (2012) and Freire (1987, 1996, 1999, 2000), so that we could answer our research question, as well as other research cited in the body of the research, which were also relevant. The activities were carried out during after-school hours from September to December 2015, where the students carried out the activities and then socialized them.