Thongklang, S. and Keeratichamroen, W. 2025. A Study of Learning Achievement on “Decimal Dilemmas” Brain-Challenge Learning Unit and Analytical Thinking of Grade 4 Students Using Brain-Based Learning with the Think-Pair-Square Technique. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University. 19, 2 (Dec. 2025), 297–311. DOI:https://doi.org/10.14456/psruhss.2025.20.