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The main aim of this thesis was to investigate the role of multidigit number processing in the development of numerical cognition. The most influential contemporary cognitive model of numeracy (TripleCode model by Dehaene, 1992) differentiates between modalityspecific processes (processing of number words vs. Arabic numbers vs. magnitude) as well as between semantic processes like number comparison and asemantic processes like transcoding. Up to date, it has not been tested empirically whether these notions are also adequate to describe the acquisition of multidigit number processing in primary school children.The findings of this thesis can be seen as clear evidence against the predictions of this model.Furthermore, all tasks assessing multidigit number processing presented with considerable gender differences in favour of boys. Finally, individual differences in multidigit number processing were predicted by general visualspatial abilities.
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