Teaching Percentage to deaf students: a journey through Three Worlds of Mathematics
This qualitative research seeks to develop the ideas of Percentage, improving the Concept Image, based on sequences of activities using teaching materials for two classes in the ninth year of Elementary School at a bilingual school for the deaf in the city of São Paulo. To achieve this objective, we carried out research studies in the area of Mathematics Education for the deaf with a focus on understanding and analyzing the dynamics of the teaching and learning process of deaf students from multiple perspectives, such as the historical relationship between Mathematics Education and education. of deaf people; the pedagogical practice of mathematics teachers; the problematization of the visuality of deaf students; trends in Mathematics Education; the diversity of deaf student profiles; the mathematical performance of deaf children and the curriculum in bilingual schools for the deaf. A study was also carried out on the percentage in the City Curriculum (2019) and in the BNCC (2017) to prepare mapping activities and didactic intervention; four activities were developed to map the Conceptual Image on a percentage of eight students to investigate the mathematical knowledge that each of them has in relation to the concept to be developed and improved in the intervention. Based on the mapping of the Conceptual Image, the didactic intervention was organized with an expository class and a sequence of three activities using various teaching materials, such as the use of images, a calculator, the “Mercado Livre” website, Wordwall software and a board game. . For data analysis, the Theory of the Three Worlds of Mathematics (Tall, 2013) and the Theory of Concept Image and Concept Definition (Tall; Vinner, 1981) will be used.