Teerachot Lokkathat และ Natthaphon Hongthong; Mahdee Waedramae. (2025) The Effects of Learning Activities Based on the GPAS 5 Steps Approach on Mathematical Concepts of Division Among Grade-2 Students. <i>Journal of Science and Science Education</i>, <i>8</i>(1), 140-151.Teerachot Lokkathat และ Natthaphon Hongthong; Mahdee Waedramae. "The Effects of Learning Activities Based on the GPAS 5 Steps Approach on Mathematical Concepts of Division Among Grade-2 Students". Journal of Science and Science Education 8 (2025):140-151.Teerachot Lokkathat และ Natthaphon Hongthong; Mahdee Waedramae. The Effects of Learning Activities Based on the GPAS 5 Steps Approach on Mathematical Concepts of Division Among Grade-2 Students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2025.