Jasim Al-Dulaimy BM, Jabbar Faris I, Risen Al-Kinan HK. Two Strategies Are Proposed According To Active Education And Their On The Effect On The Acquisition Of Mathematical Concepts For Second Grade Students In Mathematics. Opción [Internet]. 9 de junio de 2019 [citado 6 de diciembre de 2025];350:28. Disponible en: http://www.produccioncientificaluz.org/index.php/opcion/article/view/31555