Teaching Materials Containing KSE to Support Character Education in Mathematics Subjects in Elementary Schools

The purpose of the study was to determine the validity, practicality, and effectiveness of teaching materials containing KSE to support character education in mathematics lesson content. This study employs a development research approach based on Borg and Gall's research design. The subjects of the study were in class V at public elementary school Kaliboyo. The data collection instruments used were validity sheets, response questionnaires, validation sheets, and observation sheets. The findings show that experts carried out the validity test, achieving a value of 93.30% in the very valid category. The practicality test results were derived from various sources: students' questionnaires, teachers' responses, and colleagues indicated a very practical rating with an average score of 87, 90, and 92, respectively. We began the effectiveness test with the paired sample t-test on the three characters, which showed a difference in the average between the observation data before and after the study. The gain analysis for grade V students shows that the independent character, hard work character, and reading character have average values of 0.37, 0.43, and 0.32, respectively. The results of the study indicate that the KSE-filled teaching materials developed proven to be valid, practical, and effective in supporting character education.