Marwati, Dahlia, Nataria Wahyuning Subayani, & Nanang Khoirul Umam. " The Enhancement of The Ability to Calculating Multiplication in Elementary Schools Using Cogglak Media to Catch Up Post Covid-19." Journal Universitas Muhammadiyah Gresik Engineering, Social Science, and Health International Conference (UMGESHIC) [Online], 2.1 (2023): 212-221. Web. 21 Nov. 2024