PENGEMBANGAN LEMBAR KERJA PESERTA DIDIK BERBASIS PROJECT BASED LEARNING (PjBL) MATERI BANGUN RUANG
Penelitian ini bertujuan untuk mengembangkan Lembar Kerja Peserta Didik (LKPD) berbasis Project Based Learning (PjBL) pada materi bangun ruang jaring-jaring sebagai bahan ajar yang valid, praktis, dan layak digunakan dalam pembelajaran matematika. Penelitian pengembangan ini menggunakan model ADDIE yang meliputi tahap analisis, desain, pengembangan, implementasi, dan evaluasi. Subjek uji coba terdiri atas 20 peserta didik kelas IX MTsN Kota Tarakan. Instrumen yang digunakan meliputi lembar validasi ahli media, ahli materi, serta angket respon peserta didik. Hasil validasi ahli media menunjukkan persentase rata-rata 95% pada aspek penyajian dan 83% pada aspek desain, keduanya berkategori sangat valid. Hasil validasi ahli materi memperoleh persentase 85,7% untuk aspek isi dan 91,6% untuk aspek bahasa, yang juga termasuk kategori sangat valid. Uji coba terbatas menunjukkan respon peserta didik dengan nilai rata-rata 3,52 dan persentase 88%, termasuk kategori sangat baik. Respons tersebut mengindikasikan bahwa LKPD mudah digunakan, menarik, mendorong kerja sama, kreativitas, serta membantu pemahaman konsep. Dengan demikian, LKPD berbasis Project Based Learning (PjBL) yang dikembangkan dinyatakan valid, praktis, dan layak digunakan sebagai bahan ajar dalam pembelajaran matematika, khususnya pada materi jaring-jaring bangun ruang, serta berpotensi mendukung pembelajaran yang lebih aktif, kontekstual, dan bermakna. This study aimed to develop Student Worksheets (LKPD) based on Project-Based Learning (PjBL) on the topic of 3D shapes of nets as valid, practical, and feasible teaching materials for mathematics learning. This development research used the ADDIE model, which includes the stages of analysis, design, development, implementation, and evaluation. The trial subjects consisted of 20 ninth-grade students at MTsN Kota Tarakan. The instruments used validation sheets from media experts, material experts, and student response questionnaires. The results of media expert validation showed an average percentage of 95% for the presentation aspect and 83% for the design aspect, both categorized as highly valid. The validation results by material experts showed a percentage of 85.7% for content aspects and 91.6% for language aspects, which are also categorized as highly valid. Limited trials indicated student responses with an average score of 3.52 and a percentage of 88%, categorized as very good. These responses suggest that the Student Worksheet (LKPD) is easy to use, engaging, encourages cooperation and creativity, and aids in conceptual understanding. Therefore, the Project Based Learning (PjBL)-based LKPD developed is considered valid, practical, and suitable for use as teaching material in mathematics learning, particularly for the topic of three-dimensional geometric nets, and has the potential to support more active, contextual, and meaningful learning.