O eixo de setas como recurso didático: análise de dificuldades e contribuições para o ensino de juros simples no 9° ano

Abstract

Financial mathematics is a field that studies the behavior of money over time. Therefore, mastering it is a necessary condition for the application of financial education, which aims to develop citizens capable of making informed decisions, analyzing investments and risks. This study analyzes the contribution of the arrow axis as a teaching tool in solving and understanding questions about simple interest contextualized in the 9th grade, identifying the difficulties encountered in calculating simple interest through the use of visual aids and comparing student performance with and without its application. Furthermore, it is based on Raymond Duval's Theory of Semiotic Representation Registers, which seeks to consolidate mathematical knowledge through conversions between registers, and on the book "Matemática Financeira na Escola Básica: Uma abordagem prática e visual" by the Fundão Project at UFRJ. The study also includes a critical analysis of the teaching of simple interest in 9th grade classes at a municipal school in João Pessoa. This is an applied research with a quantitative and qualitative approach, explanatory and descriptive in nature, which analyzes and classifies the difficulties in teaching simple interest. The results showed that although students' main errors were in conversions between registers, the arrow axis proved effective in improving learning about simple interest in comparative tests.