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This study aims to discover how the mathematical problem-solving ability of students in class VIII using Pendidikan Matematika Realistic Indonesia (PMRI) through Lesson Study for Learning Community (LSLC) on straight-line gradient material. The subjects of this Study were Students of class VIII.B Srijaya State Junior High, totaling 32 students. The learning process takes place adapted to the principles and characteristics of PMRI through the LSLC system. Data collection the techniques used indoi:10.29408/jel.v6i2.2214 fatcat:ypoo3iqirfgrjgvuzwegu6d7a4