This study was motivated by the low student learning outcomes in the Natural and Social Sciences (IPAS) subject, attributed to a teacher-centered instructional process where students were less actively involved in understanding concepts and developing problem-solving skills. The study aimed to determine the effect of the Project-Based Learning model on fourth-grade students' IPAS learning outcomes at SD Negeri 101830 Tanjung Selamat during the 2025/2026 academic year. A quantitative approach with a pre-experimental design—specifically the One-Group Pretest-Posttest Design—was employed. The sample consisted of 25 students selected using the saturated sampling technique. Data collection utilized multiple-choice learning outcome tests administered prior to and following the intervention. Data analysis began with prerequisite testing using the Shapiro-Wilk normality test, followed by hypothesis testing using the paired sample t-test via SPSS version 25. The results indicated an improvement in student learning outcomes following the implementation of the Project-Based Learning model, with the mean pretest score rising from 64 to 78.8 on the posttest. The hypothesis test yielded a Sig. (2-tailed) value of 0.000 (< 0.05), leading to the rejection of and the acceptance of . Thus, it is concluded that the Project-Based Learning model exerts a positive and significant effect on elementary students' IPAS learning outcomes. ABSTRAK Penelitian ini dilatarbelakangi oleh rendahnya hasil belajar siswa pada mata pelajaran Ilmu Pengetahuan Alam dan Sosial (IPAS) yang disebabkan oleh proses pembelajaran yang masih cenderung berpusat pada guru, sehingga siswa kurang aktif dalam memahami konsep dan mengembangkan keterampilan pemecahan masalah. Penelitian ini bertujuan untuk mengetahui pengaruh model Project-Based Learning terhadap hasil belajar IPAS siswa kelas IV SD Negeri 101830 Tanjung Selamat Tahun Ajaran 2025/2026. Pendekatan yang digunakan adalah kuantitatif dengan metode Pre-Experimental Design melalui desain One-Group Pretest-Posttest Design. Sampel penelitian berjumlah 25 siswa yang ditentukan menggunakan teknik sampling jenuh. Pengumpulan data menggunakan instrumen tes hasil belajar berbentuk pilihan ganda sebelum dan sesudah perlakuan. Analisis data dilakukan melalui uji normalitas Shapiro-Wilk dan uji hipotesis paired sample t-test dengan bantuan aplikasi SPSS versi 25. Hasil penelitian menunjukkan adanya peningkatan hasil belajar siswa setelah diterapkan model Project-Based Learning, dengan rata-rata nilai pretest sebesar 64 meningkat menjadi 78,8 pada nilai posttest. Hasil uji hipotesis memperoleh nilai Sig. (2-tailed) sebesar 0,000 < 0,05, sehingga ditolak dan diterima. Dengan demikian, disimpulkan bahwa model Project-Based Learning berpengaruh positif dan signifikan terhadap hasil belajar IPAS siswa sekolah dasar.
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