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Table 2 Arithmetic battery part 2: calculation - mean reaction time and mean error rate percentage

From: Attentional networks in developmental dyscalculia

  Control DD
Simple operations (RT) 61 sec 123 sec**
   Addition 1.35% 4%
   Subtraction 0% 5%
   Multiplication 2.5% 4.5%
   Division 5% 8.5%
Horizontal operations (RT) 13 sec 21 sec**
   Addition 6% 17.5%
   Subtraction 23% 23%
   Multiplication 6% 15%
   Division 2% 17%*
Vertical operations (RT) 625 sec 822 sec
   Addition 5% 18%**
   Subtraction 13% 32%**
   Multiplication 26% 23%
   Division 25% 42%
Decimals (RT) 238 sec 294 sec
   Addition 12% 16%
   Subtraction 28% 58%**
   Multiplication 31% 70%*
Fraction (RT) 547 sec 658 sec*
   Addition 13% 28%
   Subtraction 9% 25%*
   Multiplication 9% 21%
   Division 5% 14%
  1. Note. An asterisk indicates a significant difference between the performances of the developmental dyscalculia group and the control group. * p < 0.05, ** p < 0.01.