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This study aims at developing an open-ended problem based mathematics learning to enhance students’ creativity. Plomp model was used to develop the instructional materials for fraction unit at grade 3. The subjects consisted of third grade students. The data was collected by observation, interview, test, dan questionnaire. The data were analyzed based on the validity, practically, and effectiveness of open-ended problem based mathematic learning. To know that the learning does enhance the students’ creativity the research implemented a quasi-experiment research. The results show that the instructional materials meet the criteria validity, practically, and effectiveness and students’ creativity of the experiment group outperform the control group. In accordance with the research results, so that, learning based on open-ended solving problems can be used as an effort to improve student’s creativity. Keywords—Creativity: Open-Ended Problem: Problem Solving.

The Open-Ended Problem Based Mathematics Learning to Increase Studentsr Creativity on Fraction for Third Grade Elementary School