Mawan V. The Development of Learning Activities for Third-grade Students Regarding Addition, Subtraction, Multiplication and Division: Using a Bar Model and a STAR Strategy. OJED [internet]. 2024 Nov. 14 [cited 2026 Aug. 26];19(2):OJED1902007 (14 pages). available from: https://so01.tci-thaijo.org/index.php/OJED/article/view/270119