Özet:

This study aims to improve critical thinking skills in elementary school fifth grade students through the model of Problem Based Learning. The research location is SDN Jepara I/90 Surabaya, the study population is students of fifth grade were 30 students. In this study using a Class Action Research (PTK) conducted by 2 cycles, with several stages of the planning phase, the implementation phase, the stage of observation and reflection stages. Data collection techniques were used that test in the form of a written test and non-test in the form of observation, that observation the activities of teachers and students' activity. The results showed that there was an increase from the first cycle to the second cycle. For the activity of teachers in the first cycle, shows the percentage of the 70% rate, and the second cycle percentage increased by 90%. Activity percentage of students in the first cycle the value of 75%, while in the second cycle of student activity increased by 95%. Then increase students' critical thinking skills can be seen from the results of evaluation of students by 70.5% in the first cycle to 89.62% in the second cycle.

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