The main objective of this research in teacher education is to investigate the contributions of
the study on Decimal Numbering System (SND), considering its History and Epistemology,
for teachers in exercise who teach Mathematics in the first years of elementary school in the
municipality of Maracanã/PA. The main theoretical references are Lerner and Sadovsky
(1996), Kamii (1996), Nogueira (2011), Curi (2013) and Ferreira, Guerra and Viana (2019).
This work with a formative perspective is a workshop, composed of four meetings, offered to
19 teachers who work in the municipal public school system of Maracanã-PA, located in the
northeast of the Amazon of Pará. To achieve the research objective, a Study Activity (EA)
was constructed with four problems on basic numerical system five and base ten to allow a
relationship between theory and practice around the mathematical object Decimal Numbering
System (SND). The results suggest the expansion on the elements that constitute the NdS:
count without grouping and by grouping, notion of numerals and numerical bases (nonpositional
and positional), among others. It was also evidenced that the Workshop enabled
collaborative actions, with discussions and socializations of productions, promoting the
change of teaching practices and the deepening of knowledge.
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