Using an Improvised Abacus to Assist Samproso M/A Junior High School Level One Pupils to Overcome the Problem of Place Value Concept in Mathematics (D. . Amoah, K. . B. Bour, S. . Boampong, & B. . Arkoh , Trans.). (2019). International Journal of Scientific Research and Management (IJSRM), 7(06), 144-165. https://doi.org/10.18535/ijsrm/v7i6.m01