Abstract
Student worksheets in schools have not been fully developed based on contextual problems that are close with student environment. Therefore, students thinking skills have not facilitated. Based on these problems, the purpose of this study is develop student worksheets based on RME that can facilitate students to improve mathematical reasoning. This research is development research that uses Plomp development model. The subject trial of this study are 31 students class VIII of Junior high school in Wonosobo. Validity assessment instrument is a validation sheet. Practical assessment instruments are teacher and student assessment sheets, also learning implementation observation sheets. The effectiveness assessment instrument is mathematical reasoning test. Data analysis was carried out by converting quantitative data into qualitative data. The results showed that student worksheet validity score was 95. Practicality based on the teacher’s assessment with a score of 37, the results based on students assessment have an average score of 62.35. Average of learning achievement is 95.37% and the results of mathematical reasoning test which shows that 96.55% of students complete the minimal mastery criteria. Therefore, student worksheet who developed is suitable for mathematics learning activities and can be used to improve students mathematical reasoning.
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