摘要：The fact that there is no much study on reversibility is one of reason this study was conducted. Others, the importance of reversibility is also being researcher’s motivation for focusing pupils’ reversibility. On the other hand, the concern on pupils’ reversibility is a major concern. The objective of this research is to identify errors done by the pupils in solving arithmetic problems related to reversibility concept. The result of this study can inspire teachers to consider the problem-solving in minimizing errors which must be done by the pupils in solving other arithmetic errors. The result of this study can be used as a reference in designing further learning and tasks for student’s reversibility development. This research is qualitative with descriptive approach. The subjects of this research are fifth grade pupils of three Elementary Schools in Jombang, Indonesia. Researcher gave arithmetic task related to reversibility concept to the research subject. The pupils’ worksheet was analyzed by calculating a number of pupils who did error for each arithmetic item. Then, it was classified to groups which were based on the error types done by the pupils. Furthermore, the researcher described error types done by the pupils related to Roberts, namely wrong operation, obvious computation error, defective algorithm, and random response. This case proved that there are some elementary school pupils who are still having difficulty in solving arithmetic problems related to reversibility concept.
关键词：Pupil’s error; concept of reversibility; solving; arithmetic problems
