<![CDATA[ABSTRACTMathematical conceptual understanding is a crucial competency in mathematics education, particularly supporting skill development at the Vocational High School (SMK) level. However, students' understanding of mathematical concepts remains relatively low, especially regarding abstract topics like geometry. Furthermore, existing teaching materials are generally print-based and lack interactivity. Therefore, there is a need for learning media that fosters active student engagement. This study aims to develop a vocational-context-oriented, Liveworksheets-based Electronic Student Worksheet (e-LKPD) to enhance the mathematical conceptual understanding of SMK students in the Office Management and Business Services (MPLB) program, while also assessing its validity, practicality, and effectiveness. The study employs the Research and Development (R&D) method using the ADDIE model, comprising the analysis, design, development, implementation, and evaluation stages. The research subjects were 40 tenth-grade students from the Office Management and Business Services (MPLB) program at an SMK in Cirebon. Data collection instruments included validation sheets for subject matter and media experts, peer assessments, teacher and student response questionnaires, and a pre-post test measuring mathematical conceptual understanding regarding plane geometry. Data were analyzed using both qualitative and quantitative descriptive methods, utilizing score percentages to determine the product's validity, practicality, and effectiveness. The results indicate that the developed vocational-context-oriented, Liveworksheets-based e-LKPD met validity criteria, with ratings of 88% from subject matter experts, 92% from media experts, and 94% from peers. Regarding practicality, it achieved a score of 90%, and regarding effectiveness, it yielded an N-Gain score of 0.66. Thus, this e-LKPD serves as a digital teaching resource that is interactive, contextual, and relevant to the characteristics of the vocational context. Keywords: conceptual understanding, e-LKPD, Liveworksheets, vocational high school (SMK) ABSTRAKKemampuan pemahaman konsep matematis merupakan kompetensi penting dalam pembelajaran matematika, yang menjadi pendukung kompetensi pada jenjang Sekolah Menengah Kejuruan (SMK). Namun, pemahaman konsep matematis siswa relatif rendah, terutama pada materi abstrak seperti geometri. Selain itu, bahan ajar yang digunakan umumnya masih bersifat cetak dan kurang interaktif. Oleh karena itu, diperlukan media pembelajaran yang mendorong keterlibatan aktif siswa. Penelitian ini bertujuan untuk mengembangkan Lembar Kerja Peserta Didik Elektronik (e-LKPD) berbasis Liveworksheets berorientasi konteks vokasional untuk meningkatkan pemahaman konsep matematis siswa SMK MPLB serta mengkaji tingkat kevalidan, kepraktisan, dan keefektifannya. Metode penelitian yang digunakan adalah penelitian dan pengembangan (Research and Development) dengan model ADDIE yang meliputi tahap analysis, design, development, implementation, dan evaluation. Subjek penelitian adalah 40 siswa kelas X SMK program keahlian Manajemen Perkantoran dan Layanan Bisnis (MPLB) di Cirebon. Instrumen pengumpulan data meliputi lembar validasi ahli materi dan ahli media, penilaian teman sejawat, angket respon guru dan siswa, dan pre-post tes kemampuan pemahaman konsep matematis pada materi geometri bidang datar. Data dianalisis secara deskriptif kualitatif dan kuantitatif menggunakan persentase skor untuk menentukan tingkat validitas, kepraktisan, dan efektivitas produk. Hasil penelitian bahwa e-LKPD berbasis Liveworksheets berorientasi konteks vokasional untuk meningkatkan pemahaman konsep matematis siswa SMK MPLB yang dikembangkan memenuhi kriteria kevalidan dari ahli materi mencapai (88%), ahli media (92%) dan teman sejawat (94%). Dari kriteria kepraktisan mencapai (90%) dan dari kriteria keefektifan memperoleh nilai N-Gain mencapai 0,66. Dengan demikian, e-LKPD ini dapat digunakan sebagai bahan ajar digital yang interaktif, kontekstual, dan relevan dengan karakteristik konteks vokasional. Kata kunci: e-LKPD, Liveworksheets, matematika, pemahaman konsep,SMK]]>
