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This study aims to analyze the improvement of Higher Order Thinking Skills (HOTS) through mathematics learning on the Three-Dimensional Geometry topic in Grade XII of Yayasan Pendidikan Al-Fattah Medan. HOTS is a crucial aspect of 21st-century education because it helps students develop critical, creative, logical, and reflective thinking skills in addressing complex problems. In the context of mathematics learning, particularly in spatial geometry, mastering HOTS not only supports students in understanding abstract concepts but also in applying them to real-life situations. This study employed a descriptive qualitative method with instruments consisting of a pre-test, post-test, and an open-ended questionnaire to explore students’ understanding and learning experiences. The findings revealed a significant improvement, where the average pre-test score of 7 increased to 52.21 in the post-test. This result highlights that the implementation of HOTS-based learning strategies is effective in enhancing students’ comprehension of distance, angles, and point positions in space, while simultaneously strengthening their analytical, evaluative, and creative abilities. The study implies the importance of adopting innovative learning strategies oriented toward HOTS development to improve the quality of mathematics education and prepare students for global challenges.

This study aims to describe how to improve students' learning outcomes in Geometry learning using the Problem Based Learning model in class V of SDN 18 Tebing Tinggi, Pesisir Selatan Regency. This type of research is classroom action research (PTK) using qualitative and quantitative approaches which are carried out in two cycles, with research procedures. The results of the study showed an increase in geometry learning outcomes from cycle I to cycle II. The results of the observation of the teaching module in the first cycle of the first meeting were obtained 79% (C) then in the first cycle of the second meeting the result of 87% (B) for that the observation of the first cycle of the teaching module was obtained an average of 83% (B), increasing in the second cycle to 95% (SB). Second, the results of the observation of the implementation of teacher aspect learning in the first cycle of the first meeting obtained a result of 78% (C), then in the first cycle of the second meeting obtained a result of 86% (B) for that the results of the observation of the teacher aspect obtained an average of 82% (B), increasing in the second cycle to 93% (SB). Third, the results of the implementation of learning aspects of students in the first cycle of meeting I obtained a result of 78% (C), then in the first cycle of meeting II obtained a result of 86% (B) for that the results of observation of the student aspect obtained an average of 82% (B), increasing in the second cycle to 93% (SB). Fourth, the learning outcomes of students in the first cycle of meeting I were obtained with a result of 71 (C), then in the first cycle of meeting II a result of 81 (B) for that the learning results of the first cycle were obtained an average of 76 (C), increasing in the second cycle to 90 (SB). Thus, it can be concluded that the Problem Based Learning model can improve students' learning outcomes in Geometry learning in grade V of SDN 18 Tebing Tinggi, South Pesisir Regency