AbstrakPenelitian ini bertujuan untuk menghasilkan perangkat pembelajaran berbasis penemuan terbimbing untuk meningkatkan kemampuan berpikir kritis dan motivasi belajar matematika pada bangun ruang di SMP. Perangkat yang dikembangkan meliputi silabus, 3 RPP, 8 handout, 8 LKS, 1 perangkat tes ketercapain pada bangun ruang sisi datar; serta silabus, 3 RPP, 2 handout, 4 LKS, 1 perangkat tes ketercapaian kompetensi pada bangun ruang sisi lengkung. Penelitian ini adalah penelitian pengembangan (research & development) dengan menggunakan model pengembangan 4D yaitu define, design, development, dan disseminate. Kevalidan perangkat ditinjau dari penilaian para ahli, kepraktisan ditinjau dari penilaian guru, penilaian peserta didik, dan observasi keterlaksanaan pembelajaran. Keefektifan ditinjau dari tes ketercapaian kompetensi, tes kemampuan berpikir kritis, dan motivasi belajar matematika peserta didik. Hasil penelitian menunjukkan bahwa perangkat pembelajaran yang dikembangkan valid, praktis, dan efektif. Kata Kunci: pengembangan, perangkat pembelajaran, penemuan terbimbing, berpikir kritis, motivasi belajar matematika
AbstractThis research was aimed to produce learning kit based guided inquiry to increase critical thinking ablity and motivation to learn mathematics on solid figures and describe the quality of the developed product. The learningkit consist of syllabus, 3 lesson plans, 8 handouts, 8 student worksheets, and a competency achievement test on plane solid figure; and syllabus, 3 lesson plans, 2 handouts, 4 student worksheets, and a competency achievement test on curve solid figure. This research was a developmental research study adapted from 4-D development model. It consisted of four phases: define, design, develop, dan disseminate. The result of validation by expert jugdement shows that the learning kit that was developed was of valid category for each learning kit that has been developed. The aspects of practicality was of very practice category as seen from the evaluation by the teachers, evaluation by the students, and implementation of the learning. The aspect of effectiveness could be reached from the competency achievement test results, critical thinking ability test results, and the results of questionnaires of student's motivation to learn mathematics. The result of this research was learning kit that has been developed valid, practical, and effective.