Students with dyslexia often face significant challenges in learning mathematics, particularly in understanding abstract symbols, lengthy textual instructions, and complex calculation procedures such as in the Three-Variable Linear Equation System (SPLTV) material. This study aims to develop a Digital Book Material specifically designed with dyslexia-friendly principles to facilitate high school students' understanding of mathematical concepts. Using the ADDIE (Analysis, Design, Development, Implementation, Evaluation) development model, this study collected data through in-depth interviews, surveys, participant observation, and product trials involving pre- and post-tests. This digital module integrates multisensory features such as accessible fonts, concrete visualizations, high-contrast color schemes, audio narration, and step-by-step procedural guidance. The evaluation results show that the use of these multimedia features effectively improves students' readability, ease of navigation, and conceptual understanding, as evidenced by positive user responses and improved learning performance. The study's conclusion confirms that the Digital Book Material is a valid and practical learning medium to support the learning needs of dyslexic students in mastering complex mathematical materials. ABSTRAK Siswa penyandang disleksia kerap menghadapi tantangan signifikan dalam pembelajaran matematika, khususnya dalam memahami simbol abstrak, instruksi tekstual yang panjang, dan prosedur perhitungan yang kompleks seperti pada materi Sistem Persamaan Linear Tiga Variabel (SPLTV). Penelitian ini bertujuan untuk mengembangkan Material Digital Book yang dirancang khusus dengan prinsip ramah disleksia guna memfasilitasi pemahaman konsep matematika siswa SMA. Menggunakan model pengembangan ADDIE (Analysis, Design, Development, Implementation, Evaluation), penelitian ini mengumpulkan data melalui wawancara mendalam, survei, observasi partisipatif, serta uji coba produk yang melibatkan pre-test dan post-test. Modul digital ini mengintegrasikan fitur multisensori berupa font aksesibel, visualisasi konkret, skema warna kontras tinggi, narasi audio, serta panduan prosedural bertahap. Hasil evaluasi menunjukkan bahwa penggunaan fitur multimedia tersebut secara efektif meningkatkan keterbacaan, kemudahan navigasi, dan pemahaman konsep siswa, sebagaimana dibuktikan oleh respon positif dari pengguna dan peningkatan performa belajar. Simpulan penelitian menegaskan bahwa Material Digital Book merupakan media pembelajaran yang valid dan praktis untuk mendukung kebutuhan belajar siswa disleksia dalam menguasai materi matematika yang kompleks.
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