Wästerlid, C. A. (2020). CONCEPTUAL SUBITIZING AND PRESCHOOL CLASS CHILDREN’S LEARNING OF THE PART-PART-WHOLE RELATIONS OF NUMBER. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 78(6), Continuous. presented at the December/2020. doi:https://doi.org/10.33225/pec/20.78.1038