Ahmad S, Mufidah I, Aryanti D, Ghazali M binti. Problem Based Learning and Their Effect on Learning Outcomes Estimation of Calculation Operations Number in Elementary School. JHETP [Internet]. 2023 Nov. 14 [cited 2024 Nov. 5];23(17). Available from: https://mail.articlegateway.com/index.php/JHETP/article/view/6532