Lola Widia Sari Nasution and Sujarwo 2023. Improving Student Learning Outcomes in Theme 2 Always Saving Energy Through Problem Based Learning Models Assisted by Audio Visual Media in Class IV SD IT Darussalam Deli Tua. International Journal of Educational Research Excellence (IJERE). 2, 2 (Jul. 2023), 191–196. DOI:https://doi.org/10.55299/ijere.v2i2.463.