From manipulation to abstraction: the impact of flexible decomposition on numerical competence in primary school

Raw test scores from a quasi-experimental study (pre-test / post-test with delayed post-test) on the impact of CPA intervention (flexible decomposition) on numerical competence in primary school. N = 120 students, grades 4 and 5. Variables include 5 test scores (positional value, decomposition, reading/writing numbers, ordering/comparison, real-world application). Sheets: RAW_data (long format) and class-based sheets (4A–5C) for simplified calculations.