Wulandari, M., Yolviansyah, F. and Misastri, M. 2023. Team Assisted Individualization: Improving Number Competency Students’ Understanding of Mathematical Concepts. Journal of Basic Education Research. 4, 1 (Jan. 2023), 20-30. DOI:https://doi.org/10.37251/jber.v4i1.304.