<![CDATA[ABSTRACT The low level of students’ critical thinking skills is partly influenced by the selection of inappropriate learning models in the instructional process. This study aims to develop a mathematics learning module based on Problem-Based Learning (PBL) that meets the criteria of validity, practicality, and effectiveness for the topic of Systems of Linear Equations in Three Variables (SLETV) for Grade X students. The study employed a Research and Development (R&D) method using the ADDIE model, which consists of five stages: analysis, design, development, implementation, and evaluation. The research subjects were 20 Grade X students of SMK Wijaya Putra Surabaya. The research instruments included validity sheets, practicality sheets, and effectiveness sheets. Based on the results of the mathematics learning module trial, the module was declared (1) valid based on expert validation with a percentage score of 95.5%, categorized as very valid; (2) practical based on teacher and student response questionnaires with a percentage of 83.75%, categorized as very good; and (3) effective, as evidenced by a limited trial involving 20 students at SMK Wijaya Putra, which showed an increase in test scores from 50.6 to 77.1. These results indicate that the developed learning module meets the criteria of validity, practicality, and effectiveness and can be used in teaching the topic of SLETV. ABSTRAK Rendahnya kemampuan berpikir kritis peserta didik salah satunya dipengaruhi oleh pemilihan model pembelajaran yang kurang sesuai dalam proses pembelajaran. Penelitian ini bertujuan menghasilkan modul pembelajaran matematika berbasis Problem-Based Learning (PBL) yang memenuhi kriteria validitas, kepraktisan, dan keefektifan pada materi Sistem Persamaan Linear Tiga Variabel (SPLTV) untuk siswa kelas X. Penelitian ini menerapkan metode Research and Development (R&D) dengan model ADDIE yang meliputi lima tahap, yaitu analisis, perancangan, pengembangan, penerapan, dan evaluasi. Subjek penelitian ini yaitu 20 siswa kelas X SMK Wijaya Putra Surabaya. Instrumen penelitian yang digunakan adalah lembar kevalidan, lembar kepraktisan, dan lembar keefektifan. Berdasarkan hasil uji coba modul pembelajaran matematika, modul dinyatakan (1) valid berdasarkan penilaian validator dengan hasil persentase sebesar 95,5% yang berkategori sangat valid; (2) praktis berdasarkan angket respon guru dan siswa sebesar 83,75% yang berkategori sangat baik dan (3) efektif sebagaimana dibuktikan oleh uji coba terbatas pada 20 siswa di SMK Wijaya Putra, yang menunjukkan peningkatan skor tes dari 50,6 menjadi 77,1. Hasil ini menunjukkan bahwa modul pembelajaran memenuhi kriteria valid, praktis, dan efektif yang dapat digunakan dalam pembelajaran pada materi SPLTV.]]>
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