The ability of mathematical reflective thinking is the ability to interpret a case based on the mathematical concepts involved, can evaluate the truth of an argument, can draw analogies from two similar cases, can analyze and clarify questions and answers, can generalize, and can distinguish between relevant data and not relevant. This ability is one of the high-level thinking skills that can be optimized through integrated learning in everyday life, namely learning with Environmental Based Problem Based Learning. To find out, a quasi-experimental study was conducted which aimed to find out the improvement of mathematical reflective thinking skills in terms of the high, medium and low mathematical abilities of the group. The subject of the research was class XI in SMA Negeri 1 Cilegon which was selected by cluster random sampling in the sequence and series material. The results of the data analysis showed that the Environmental Based Problem Based Learning model was better than the expository learning in improving the achievement and improvement of students' mathematical reflective thinking skills both viewed as a whole and viewed from the initial high, medium and low mathematical abilities. ABSTRAKKemampuan berpikir reflektif matematis adalah kemampuan untuk menginterpretasi suatu kasus berdasarkan konsep matematika yang terlibat, dapat mengevaluasi kebenaran suatu argumen, dapat menarik analogi dari dua kasus serupa, dapat menganalisis dan mengklarifikasi pertanyaan dan jawaban, dapat menggeneralisasi, serta dapat membedakan antara data yang relevan dan tidak relevan. Kemampuan ini merupakan salah satu kemampuan berpikir tingkat tinggi yang bisa dioptimalkan melalui pembelajaran yang terintegrasi dalam kehidupan sehari-hari, yaitu pembelajaran dengan Problem Based Learning Berbasis Lingkungan. Untuk mengetahui itu dilakukan penelitian kuasi eksperimen yang bertujuan mengetahui peningkatan kemampuan berpikir reflektif matematis ditinjau dari kemampuan awal matematis kelompok tinggi, sedang dan rendah. Subjek penelitian adalah kelas XI di SMA Negeri 1 Cilegon yang dipilih secara cluster random sampling pada materi barisan dan deret. Hasil analisis data menunjukkan model Problem Based Learning Berbasis Lingkungan lebih baik dibandingkan dengan pembelajaran ekspositori dalam meningkatkan pencapaian dan peningkatan kemampuan berpikir reflektif matematis peserta didik baik dilihat secara keseluruhan maupun ditinjau dari kemampuan awal matematis tinggi, sedang dan rendah. Kata kunci: kemampuan berpikir reflektif matematis, Problem Based Learning berbasis lingkungan.
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