The Role of Local Culture in North Sumatra in Improving Mathematical Ability in the Learning of Space Shapes for 5th Grade Elementary School Students. impian j. [Internet]. 2024 Dec. 22 [cited 2026 Aug. 14];4(2):147-54. Available from: https://jurnal.fkip.unmul.ac.id/index.php/impian/article/view/4329