Potencialidades e limitações de propostas de ensino com uso da reta numérica como suporte para as operações básicas com números inteiros no 7º ano do ensino fundamental

Abstract

This research is part of the field of Mathematics Education whose objective is to investigate the potential and limitations of proposed activities with the support of the number line on basic operations with integer numbers in the 7th year of elementary school. In this research, we identified potentials and limitations of proposals for different teaching resources: a textbook, two resources produced for teachers and the Geogebra software. This research, in terms of objectives, is exploratory, in terms of technical resources for data collection; it is bibliographical and has a qualitative approach. We analyzed these proposals from the following categories: 1) It includes BNCC skills; 2) It deals with the 4 operations in the number line; 3) Differentiates the minus sign from the sign subtraction operation that indicates a negative quantity; 4) Ease of using the number line to calculate the result; 5) Student participation in representing the result of the operation on the number line. The analysis allowed us to understand how to work the four operations in the number line in each proposal analyzed in this work. The number line also helps students better understand the rules of signs. This research will be a way to show students and teachers the importance of understanding the potential and limitations of using the number line in teaching proposals in different resources for the specific case of operations with integers. These strengths and limitations should encourage teachers to look for complementary resources that expand the teacher's repertoire of proposals according to their teaching objectives and the needs of their students.