Amir Mahmud Hasibuan, Noven Christoper Butarbutar and Niko Alriadi Sinaga (2025) “CHALLENGES OF ELEMENTARY SCHOOL STUDENTS IN UNDERSTANDING ADDITION SENTENCES AND TEACHER STRATEGIES: A LITERATURE REVIEW”, Jurnal Merah Putih Sekolah Dasar, 2(3), pp. 228–236. doi: 10.24114/jmpsd.v2i5.71037.