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From Manipulation to Abstraction: The Impact of Flexible Decomposition on Numerical Competence in Primary School
This study examines a structured instructional approach to the decomposition and recomposition of large numbers in six primary school classes (three 4th-grade and three 5th-grade, N = 120), using a quasi-experimental pre-test/post-test design with a control group and a four-week delayed post-test. T
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