Uma análise na resolução de problemas que envolvem o cálculo de porcentagem em questões do livro didático e da OBMEP

Abstract

The present work comes to present the results of an investigation into a state school of elementary and high school in the town of Rio Tinto - PB, in order to analyze the relationships between the didactic book issues and issues of Mathematics Olympics Public Schools (OBMEP) with respect to the content of the Percentages calculation. The methodology used to achieve the proposed objectives, and the procedures were bibliographic research and study of the case. As to the objectives, the research was characterized as exploratory and the method of approach the problem, was the qualitative and quantitative. Already the instrument used in the collection of research data was a questionnaire diagnostic containing four questions of the textbook and four questions of OBMEP database in previous years, the size of the sample were forty students of two classes of eighth and ninth year of elementary school. Regarding the results, the data show that there is a big deficiency in relation to the student's knowledge in the calculation of percentages, since the resolutions of the issues both of didactic book as the OBMEP, also were much lower than expected.