<![CDATA[This research aims to describe the problemsolvingskills of SMA Negeri 1 Tinambungstudents in biology subjects. The kind of research used is descriptive research with survey method using simple random sampling technique. The research subjects in this study were students of class XI MIA which consisted of 5 classes and each class was represented by 11 people, so the research subjects amounted to 55 respondent. Data collection in this study used problem solving skills test questions in the form of essays and structured interviews with biology subject teachers, lesson plan document which were intended to serve as additional information on research results. Based on the test results, the problem solving skills of students are in the less category with the percentage of understand problem 42.27%, plan completion 56.36%, solve the problem 33.18%, review procces and results 53.18%. Based on these data, it can be concluded that the problem solving skills of class XI SMA Negeri 1 Tinambung is still not enough. Thus, it is necessary to apply learning that it can improveproblem solving skillsKeywords :, ,]]>
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