(A) When children with DD solved subtraction problems, both correct and incorrect trials activated bilateral intraparietal sulcus (IPS), supplementary motor area (SMA), visual cortex, left premotor cortex, and left inferior frontal gyrus. (B) Direct comparison between correct and incorrect trials revealed no differences in the IPS or other task-relevant cortical regions. Incorrect trials produced greater activity in the right ventral occipito-temporal cortex, cerebellum, brain stem and thalamus. Threshold as in Table 3, color bar indicates t-score.