ZA4450 Databases Z719 Libraries (General) QA Mathematics L Education (General) Pendidikan Guru Sekolah Dasar 130106 Secondary Education 130303 Education Assessment and Evaluation Ability to Understand Mathematical Concepts Belief Conceptual Understanding Ability Geometry L Education Mathematical Representation Non-Routine Problem Pendekatan open ended Pendidikan Bahasa Indonesia Personality Type Problem Solving Realistic Mathematics Education action research critical thinking ability kemampuan berpikir kritis mathematic problem solving open ended approach pemecahan masalah matematika pendidikan dasar penelitian tindakan