<![CDATA[Penelitian ini bertujuan untuk mengembangkan LKS model PjBL dalam meningkatkan kemampuan pemecahan masalah matematis siswa. Model penelitian ini menggunakan ADDIE. Subjek penelitian berjumlah 29 siswa SMP Muhammadiyah 1 Yogyakarta. Instrumen penelitian meliputi angket penilaian kepraktisan guru dan siswa, lembar observasi keterlaksanaan pembelajaran, tes kemampuan pemecahan masalah. Hasil penelitian menunjukkan bahwa LKS berbasis PjBL yang dikembangkan memenuhi aspek valid dengan kriteria “baik”, memenuhi aspek praktis dengan kriteria “Sangat Baik”, dan memenuhi aspek efektif dimana diperoleh nilai rata-rata siswa lebih dari 73. Dapat disimpulkan bahwa LKS berbasis PjBL efektif untuk meningkatkan kemampuan pemecahan masalah siswa dan memenuhi aspek kevalidan, kepraktisan dan keefektifan. This research aims to develop PjBL model worksheets to improve students' mathematical problem-solving abilities. This research model uses ADDIE. The research subjects were 29 students of SMP Muhammadiyah 1 Yogyakarta. Research instruments include teacher and student practicality assessment questionnaires, learning implementation observation sheets, and problem-solving ability tests. The results of the research show that the PjBL-based LKS that were developed meet the valid aspects with the "good" criteria, fulfill the practical aspects with the "Very Good" criteria, and fulfill the effective aspects where the average student score is more than 73. It can be concluded that the PjBL-based LKS are effective in improving students' problem-solving abilities and fulfilling aspects of validity, practicality, and effectiveness.]]>
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