<![CDATA[Students need critical thinking skills for their future life. This is by 21st-century learning and government mandates. The purpose of this study was to determine the profile of critical thinking skills of students in SMA Batik 1 Surakarta. The research method is descriptive quantitative. Data collection was carried out by observation through critical thinking skills tests. The test instrument consists of 4 biological problems that require solving with indicators of critical thinking skills from Ennis in terms of questioning skills, drawing conclusions, evaluating, presenting reasons, and analysis. Retrieval of data on class XI-MIPA students as many as 206 students. The scoring results are converted to test result scores. The results of the study concluded that the profile of students' critical thinking skills with an average score of 55.4 with the basic level category. Skills to arrange student questions on basic level criteria, with an average score of 2.1. Skills to arrange students' reasons on the basic level criteria, with an average score of 2.4. Skills to conclude students on basic level criteria, with an average score of 2.0. Skills to arrange relationships between one data and another data students are at the advanced level criteria, with an average score of 2.6. Student evaluation skills at the basic level criteria, with an average score of 2.5]]>
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