This study aims to see whether the increase in mathematical communication skills of students who receive learning with an open-ended approach is better than students who receive conventional learning. The population in this study were all UMSU mathematics education students for the 2019/2020 academic year. Sampling using purposive sampling. The research instrument used was a test of students' mathematical communication skills, observation sheets and interview guidelines. Data analysis using T test. The results showed that improving the mathematical communication skills of students who receive learning with an open-ended approach better than students who receive conventional learning. It can be concluded that learning using an open-ended approach can improve students' mathematical communication skills and can increase student activity during learning. Therefore, lecturers and teachers should make learning with an open-ended approach during learning.
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