@inproceedings{pme336559-kaiserbeginningthirdgr,
  title={Beginning Third-grade Students’ Manipulative-based Understanding of the Place-value Position Principle for Two-digit and Three-digit Numbers},
  author={Kaiser, Anna and Ufer, Stefan},
  booktitle={Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1},
  year={2026},
  pages={731--738},
  publisher={Psychology of Mathematics Education (PME)},
  issn={2790-3648}
}