<![CDATA[This study aims to examine the improvement of deaf students' numeracy skills through Discovery Learning assisted by SIBI-based (Sistem Isyarat Bahasa Indonesia) e-module and describe their numeracy skills in terms of self-confidence through Discovery Learning assisted by SIBI-based. A mixed-methods approach was employed, combining a quantitative Single Subject Research and qualitative descriptive analysis. The subjects were three seventh-grade deaf students from SLB Muhammadiyah Surya Gemilang. Data were collected through observation, interviews, questionnaires, and tests. The research proceeded through three stages: preparation (initial observation), implementation (administering tests, interviews, and questionnaires), and data analysis. The findings reveal: (1) numeracy test scores for all three subjects increased during the intervention phase compared to baseline-1, marked by a positive sign (+) in the level change B1/A; and (2) all three deaf students achieved a "good" category in numeracy skills when learning with the SIBI-based e-module. Regarding self-confidence, Subjects 1 and 2 fell into the "good" category, while Subject 3 fell into the "fairly good" category. Therefore, Discovery Learning assisted by SIBI-based e-modules, when reviewed through self-confidence, supports deaf students' numeracy abilities. These findings indicate that this approach can serve as an alternative strategy for mathematics instruction in special schools (SLB).]]>
