Jasim Al-Dulaimy, B. M., Jabbar Faris, I., & Risen Al-Kinan, H. K. (2019). 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, 35, 28. Recuperado a partir de https://produccioncientificaluz.org/index.php/opcion/article/view/31555