@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}
}