Pansood S, Lincharoen A. The Development of Learning Activities Using the Open Approach Combined with the SSCS Model to Enhance Mathematical Problem-Solving Ability on Statistics among Grade 8 Students . JBER [internet]. 2025 Oct. 2 [cited 2026 Aug. 28];11(4):324-37. available from: https://so06.tci-thaijo.org/index.php/jber/article/view/284760