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This study is aiming to describe an increase in understanding of students' mathematical concepts and student responses through the application of the TSTS type cooperative learning model. This type of research is classroom action research conducted in three cycles. The subjects of this study were students of class VII.1 SMPN 2 Singaraja as many as 32 students in the odd semester of the 2018/2019 academic year. Data on understanding students' mathematical concepts was measured using concept understanding tests in the form of descriptions. Student response data was measured using a questionnaire. The data obtained were analyzed descriptively. The results of the study show that the average value of understanding concepts from cycle to successive cycles is 63.44; 74.69; and 81.88 with the average value increasing from cycle to cycle in a row, namely 7.19 and 11.25. Increased understanding of students' mathematical concepts because teacher provide more intensive supervision of students in the work of LKS used the model cooperative type TSTS. Learning activities carried out provide an opportunity for students to find their own concepts to be learned. In addition, the students respond are positively to the cooperative learning model of the TSTS type.

PENINGKATAN PEMAHAMAN KONSEP SISWA KELAS VII.1 SMP N 2 SINGARAJA MELALUI PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE TWO STAY TWO STRAY (TSTS)