english

Abstrak

. One of the abilities that must be possessed in mastering mathematics is mastery of mathematical concepts. To improve understanding of the mathematical concepts of percent material, a lot of effort is needed, including through problem solvingopen ended. Questionopen ended open-ended ones require comprehensive mastery of the material in solving the problem. The method used in this research is descriptive qualitative which describes the process of describing a situation observed in the field. Grade 5 students of SDN Sirahcai Sumedang Regency are the subjects of this research. A total of 20 students were given practice questionsopen ended regarding percent material. The data obtained comes from test results and interviews. The research results for each indicator are as follows: a) Restating the concept 80%, b) Classifying the objects that form the concept 35%, c) Identifying the nature of the concept 65%, d) Applying the concept logically 70%, e) Providing examples or non-examples concept 60%, f) Presenting concepts in various forms of representation 30%, (g) Linking various concepts, 60%, (h) Developing necessary or sufficient conditions 50%. From these results, errors were found that lie in errors in understanding the idea of ​​the questions, inability to retrieve information from the question data, errors in understanding logic in conclusions, and errors in solution strategies.