@article{art2175,
  title = {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},
  doi = {10.18535/ijsrm/v7i6.m01},
  url = {https://ijsrm.net/index.php/ijecs/article/view/2175}
}