Students' Error Analysis in Solving The Math Word Problems of High Order Thinking Skills (HOTS) Type on Trigonometry Application

An endeavour to improve the quality of education have been made by improving the implementation of learning. The effort has not been enough to show satisfactory results. This can be seen from the mathematics learning achievement shown by the students still low. Based application PAMER UN 2017 by PUSPENDIK, Mathematics National Exam problems that have the lowest absorption is on trigonometry application. This study aimed to find out the errors of students in solving the HOTS type problem in the application of trigonometry. The type of this research is qualitative descriptive research. The subjects of the research are 189 students from three Vocational High Schools in Gunungkidul Regency, Indonesia, with high, medium and low school category using stratified cluster random sampling technique. To collect the data, this research conducted observations, tests, and interviews. Data analysis techniques include data reduction, triangulation of data that was compared with data result of observation, test, and result of interviews. The results of the analysis show there were three types of errors, namely error type I (understand the meaning of the problem), error type II (applying the concept), and error type III (calculating). The cause of student error type I was lack of understanding the meaning of the problem to make mathematical modeling. In the error type II, students have difficulties distinguishing between V-shaped depression and elevation, students were confused to use the concepts and formulas. Error type III is when the students were not precise in the calculations or in a hurry to do the problem.