Arie Fernandes. 2026. Development of Teaching Materials Using a Deep learning Approach Based on Ethnomathematics through the Batik Rongkong Context to Improve Mathematical Literacy Skills (supervised by Patmaniar and Syamsu Alam).

The low level of students’ mathematical literacy and the need for contextual teaching materials have encouraged the development of teaching materials based on Deep learning and ethnomathematics through the cultural context of Batik Rongkong. This study aimed to develop mathematics teaching materials that are valid, practical, and effective in improving students’ mathematical literacy skills. The study employed a Research and Development (R&D) method using the ADDIE development model (Analysis, Design, Development, Implementation, and Evaluation). The research subjects consisted of expert validators, teachers, and ninth-grade junior high school students, with 25 students involved in the effectiveness evaluation. The research instruments included validation sheets, learning implementation observation sheets, teacher and student response questionnaires, and a mathematical literacy test. The data were analyzed using descriptive statistics, percentage analysis, N-Gain, the Shapiro–Wilk normality test, the Paired Samples T-Test, and Cohen’s d effect size. The results showed that the developed teaching materials were feasible and practical for use in mathematics learning. The implementation of learning activities and user responses indicated very positive acceptance. Students’ mathematical literacy skills increased, with a mean N-Gain score of 0.671, categorized as moderate. The Paired Samples T-Test indicated a significant difference between students’ mathematical literacy skills before and after the implementation of the teaching materials (p < 0.001), with a Cohen’s d effect size of 4.06, indicating a very large effect. Therefore, the teaching materials based on Deep learning and ethnomathematics through the Batik Rongkong context were effective in improving students’ mathematical literacy skills while providing a contextual and meaningful mathematics learning experience.