Higher-order thinking skills are 21st-century competencies that must be mastered by students. Higher-order thinking skills can be seen in student learning outcomes. Students' higher-order thinking skills can be improved by choosing the right learning media, one of which is by using animated video media. The purpose of this study was to measure the effectiveness of animated videos to improve the high-order thinking skills of SMA Negeri 1 Silat Hulu students. The method used in this research is the experimental method. The form of study used a quasi-experimental design with a nonequivalent control group design. The research subjects were all students of class XI IPA. The instrument used is a question of pretest-posttest. Data analysis used a t-test and N-Gain Score. The conclusions of this study are: (1) there is a significant difference between the students' higher-order thinking skills in the experimental group and the control group. This is evidenced by the independent sample t-test which obtained a significance level of 0.000 <0.05. (2) animation video media is effective in improving students' higher-order thinking skills as seen from the results of the calculation of the N-gain score of 0.61 with a moderate interpretation.
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