S. A. Frimpong, K. A. Dwumfuo, E. Soadwa, and F. Antwi , Trans., “Designing A Place Value Chart to Help Pupils In Basic Three Subtract Three-Digit Numbers”, int.jour.sci.res.mana, vol. 12, no. 11, pp. 3748–3765, Nov. 2024, doi: 10.18535/ijsrm/v12i11.el01.