Tampubolon S, Sihaloho FAS, Hasibuan VU. IMPROVING STUDENT LEARNING OUTCOMES IN MATHEMATICS SUBJECTS USING PROBLEM SOLVING METHODS IN CLASS IV SD 107400 B. KHALIPAH ACADEMIC YEAR 2020-2021. REKOGNISI [Internet]. 2022 Dec. 1 [cited 2025 Apr. 5];7(2):28-34. Available from: https://jurnal.unusu.ac.id/index.php/rekognisi/article/view/152