<![CDATA[This study was motivated by the low mathematical problem-solving ability of fifth-grade students at Ta’allumul Huda Islamic Elementary School, Bumiayu, as indicated by the average pre-research scores, which were below the Minimum Mastery Criteria. The study aimed to examine the differences in and improvement of students’ mathematical problem-solving skills following the implementation of the Project Based Learning (PjBL) model supported by Student Worksheets (LKPD) integrating local wisdom, compared with conventional instruction. A quantitative approach was employed using a Quasi-Experimental method with a Nonequivalent Control Group Design. The population consisted of all fifth-grade students, and total sampling was applied, with class VA serving as the control group and class VB as the experimental group. Data were collected through observation, documentation, and a mathematical problem-solving test. The data were analyzed using the Independent Sample T-Test and the Paired Sample T-Test. The results showed a significant difference between the two groups. The experimental group, which implemented the PjBL model, obtained a mean posttest score of 63.97, which was higher than the control group, which received conventional instruction and obtained a mean score of 59.87. This difference was further supported by the results of the Independent Samples T-Test, which showed a t-count value of 2.1468 t-table value of 1.9990. Furthermore, the PjBL model was proven to improve student’s problem-solving abilities, as indicated by the t-count value of 9.0755 t-table value of 2.0369. Based on these findings, it was concluded that the Project Based Learning model supported by student worksheet (LKPD) integrating local wisdom has a positive effect on the mathematical problem-solving skills of fifth-grade students. ABSTRAK Penelitian ini dilatarbelakangi oleh rendahnya kemampuan pemecahan masalah Matematika siswa kelas V di SD Islam Ta’allumul Huda Bumiayu yang ditunjukkan oleh rata-rata nilai pra-penelitian yang masih berada di bawah Kriteria Ketuntasan Minimal. Penelitian bertujuan untuk mengetahui perbedaan dan peningkatan kemampuan tersebut setelah penerapan model Project Based Learning berbantuan Lembar Kerja Peserta Didik (LKPD) bermuatan kearifan lokal dibandingkan dengan pembelajaran konvensional. Penelitian menggunakan pendekatan kuantitatif dengan metode Quasi Experimental Design melalui desain Nonequivalent Control Group Design. Populasi meliputi seluruh siswa kelas V, dengan teknik sampling total, kelas VA sebagai kelas kontrol dan kelas VB sebagai kelas eksperimen. Teknik pengumpulan data berupa observasi, dokumentasi, dan tes. Kemudian dianalisis menggunakan uji Independent Sample T-Test dan Paired Sample T-Test. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang signifikan antara kedua kelompok. Rata-rata nilai posttest kelas eksperimen yang menerapkan PjBL adalah 63,97, lebih tinggi dibandingkan kelas kontrol dengan pembelajaran konvensional yang memperoleh rata-rata 59,87. Perbedaan ini diperkuat dengan hasil uji Independent Sample T-Test yang menunjukkan nilai Thitung sebesar 2,1468 Ttabel sebesar 1,9990. Selain itu, model PjBL juga terbukti meningkatkan kemampuan pemecahan masalah dengan nilai Thitung Ttabel (9,0755 2,0369). Berdasarkan hasil tersebut, dapat disimpulkan bahwa model Project Based Learning berbantuan LKPD bermuatan kearifan lokal memberikan pengaruh positif terhadap kemampuan pemecahan masalah Matematika siswa kelas V.]]>
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