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Kongthum1*, A. .; Numnaphol, K.; Sarakhun, N. .; Kalam, S. .; Wirat, U. .; Summart, P. .; Singhara, P. . Developing learning achievement for Mathematics Subject on topic Fractions By activities inquiry-based learning (5Es) of students in Prathomsuksa 6 at Loeng Nok Tha Kindergarten School Yasothon Primary Educational Service Area Office 2: Developing learning achievement for Mathematics Subject on topic Fractions By activities inquiry-based learning (5Es) of students in Prathomsuksa 6 at Loeng Nok Tha Kindergarten School Yasothon Primary Educational Service Area Office 2. rtnb 2024, 6, 532-546.