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Ahmad, S., Mufidah, I., Aryanti, D. and Ghazali, M. binti 2023. Problem Based Learning and Their Effect on Learning Outcomes Estimation of Calculation Operations Number in Elementary School. Journal of Higher Education Theory and Practice. 23, 17 (Nov. 2023). DOI:https://doi.org/10.33423/jhetp.v23i17.6532.