<![CDATA[Abstract: This study aims to determine the effect of the Open-Ended approach on creative thinking and understanding of flat shapes in fifth-grade students. This quantitative study used a quasi-experimental method with a non-equivalent control group design involving 42 students. Data were collected using essay tests. The results showed that the Open-Ended approach significantly improves creative thinking (t-count = -4.749; Sig. = 0.000026; N-Gain = 0.567) and understanding of flat shapes (t-count = -5.654; Sig. = 0.000001; N-Gain = 0.569). The experimental group's posttest scores were higher than the control group. This study concludes that the Open-Ended approach significantly and effectively improves elementary students' creative thinking and conceptual understanding. Keyword: Open-Ended Approach, Creative Thinking, Conceptual Understanding, Flat Shape Abstrak: Penelitian ini bertujuan mengetahui pengaruh pendekatan Open-Ended terhadap berpikir kreatif dan pemahaman konsep bangun datar siswa kelas V. Penelitian kuantitatif ini menggunakan metode quasi experiment dengan desain non-equivalent control group design melibatkan 42 siswa. Data dikumpulkan menggunakan tes uraian. Hasil penelitian menunjukkan pendekatan Open-Ended berpengaruh signifikan terhadap berpikir kreatif (t-hitung = -4,749; Sig. = 0,000026; N-Gain = 0,567) dan pemahaman konsep bangun datar (t-hitung = -5,654; Sig. = 0,000001; N-Gain = 0,569). Nilai posttest kelompok eksperimen lebih tinggi daripada kelompok kontrol. Simpulan penelitian ini adalah pendekatan Open-Ended berpengaruh signifikan dan efektif meningkatkan berpikir kreatif dan pemahaman konsep siswa SD. Kata Kunci: Pendekatan Open-Ended, Berpikir Kreatif, Pemahaman Konsep, Bangun Datar ]]>
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