Developmental dyscalculia (DD) is marked by specific deficits in processing numerical and mathematical information despite normal intelligence (IQ) and reading ability. We examined how brain circuits used by young children with DD to solve simple addition and subtraction problems differ from those used by typically developing (TD) children who…

Examined the relationship between counting knowledge and computational skills for 13 mathematically disabled (MD) first graders who showed a delay in acquiring mathematical skills and 24 nondisabled first graders. MD children's immature counting knowledge and poor skills at detecting counting errors underlay their poor computational skills on an…

Chinese and American kindergarten children were given a test of addition skills, a numerical memory span measure, and an addition strategy assessment. When unable to retrieve an addition fact from memory, Chinese children counted verbally, whereas American children used finger counting or guessed. This difference appeared to be related to a…

Compared young mathematically disabled and academically normal children in terms of the distribution of strategies and solution times involved with simple addition problems. Performance characteristics of normal students and disabled students who improved were essentially the same, whereas those of disabled students who did not change were…