Ayu Sepvina, Juli Yanti Harahap. Efforts to Improve the Ability of Mastering the Concept of Number Using Number Bag Media in Children Aged 4–5 Years in PAUD Kita Jaya Beach District is a Mirror for 2021/2022 Academic Year. IJERE [Internet]. 2022 Dec. 5 [cited 2024 May 21];1(2):179-83. Available from: https://ejournal.ipinternasional.com/index.php/ijere/article/view/210