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Apriyani R, Somakim -, Darmawijoyo -. DEVELOPING TEACHING MATERIAL OF DIRECT PROPORTION BASED ON AGRICULTURAL CONTEXT. JK [Internet]. 2017 Jul. 12 [cited 2025 May 16];1(1):38-49. Available from: https://jurnal.uny.ac.id/index.php/jk/article/view/9710