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Abstract

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.

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