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This research is a Classroom Action Research (CAR) which is carried out with three cycles, each cycle is held 2 x meetings, and each cycle is carried out 4 x 45 minutes. The purpose of this study was to improve mathematical problem solving and learning activities of Social Sciences class X students of SMA 8 Garut on Trigonometry material through efforts to improve actions taken from cycle to cycle. The subjects in this study were students of class X IPS in SMA 8 Garut even semester of the school year 2018 - 2019 which numbered 32 people. Data collection techniques in classroom action research are observations of students mathematics learning activities, the value of learning outcomes, obtained from the students final tests conducted at the end of each cycle, interviews, and documentation. The data in this study used a mathematical problem-solving test for each cycle and analyzed using qualitative. Descriptive statistics are used for analysis to describe mathematical communication skills in solving mathematical problem-solving questions after learning, and the percentage of mastery learning obtained by students in each cycle. Data from observations of student mathematics learning activities and interviews were analyzed qualitatively. The results of this study reveal that mathematical problem solving and learning activities of Social Sciences class X students of SMA 8 Garut in Trigonometry material have increased from cycle to cycle through efforts to improve the actions taken.