Font Size: 

Lesson Study for Learning Community (LSLC) is one of the efforts that can be done to improve teacher learning abilities. LSLC is an activity that can solve problems faced by teachers by applying various methods or appropriate learning strategies according to the demands of the 2013 curriculum and 21st century skills. PMRI is a learning approach that is associated with real things or real situations that students have experienced so that the role of PMRI is very important. support the implementation of LSLC. The method used is descriptive qualitative research. While data collection is done by observation, documentation, field notes, and the results of LKPD based on the RPP that has been designed. This research was conducted on students of SMA Negeri Sumsel in Palembang class XII with the subject matter of three dimensions. The activities in this research consist of four stages; Plan, Do, See, and Re-design. The media used is LKPD. The results of this study indicate that learning with the application of PMRI-based LSLC can help students understand the concept of three-dimensional material, can build good collegiality between mathematics teachers, can solve problems faced by teachers, implementation of learning is in favor of students, and teachers gain experience about learning with PMRI based LSLC.

LSLC, PMRI, Dimensi tiga, 21st century skills