Procedural error of XIIth grade high school students in solving algebra problems based on Elbrink's theory

Abstract

This study was intended to determine procedural errors made by students in solving mathematics problems. This was a descriptive qualitative study. The selected subjects were high school students in Karanganyar Regency. The subject-taking technique was purposive random with snowball sampling. The types of procedural errors revealed by Elbrink found in this study were: (1) Misidentification, students made mistakes in applying the algorithm by finding that some students were still not precise in implementing the search line and comparing the function value of each extreme point, which was not needed to solve the problem, (2) Misgeneralization, students made mistakes by generalizing an existing concept and thinking that the general rules of linear program were the real rules, and (3) Repair Theory, students did not understand how to solve the mathematical problems, they made mistakes by directly using any x and y values to find the extreme point to solve linear program problems, without paying attention to inequalities as the requirements and limitations to the questions.