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Cortical activation in the parieto-temporal ROIs. a Significant change in parieto-temporal activation from grade 6 to grade 7 in the addition task (*p < .05). b Significantly increased left parieto-temporal activation for simple compared to complex blocks in the addition task (*p < .05). c Significant change in parieto-temporal activation from grade 6 to grade 7 in the multiplication task (*p < .05). Error bars indicate 1 SE of M
