Deenoo N, Bangtho K, Hemapandha C. THE DEVELOPMENT OF MATHEMICAL PROBLEM SOLVING ABILITY GRADE 4 STUDENTS BY USING TEACHING MATHEMATICS THROUGH PROBLEM SOLVING . JSC [internet]. 2025 Jul. 24 [cited 2026 Jan. 8];9(7):230-43. available from: https://so06.tci-thaijo.org/index.php/JSC/article/view/286633