Developmental Dyscalculia (DD) is characterised by impairments in learning basic arithmetic facts, processing numerical magnitude and performing accurate and fluent calculations. These difficulties are quantifiably below what is expected for an individual’s chronological age, and are not caused by poor educational or daily activities or by intellectual impairments.


Dyscalculia often occurs in association with other developmental disorders such as dyslexia or ADHD/ADD. Co-occurrence is generally assumed to be a consequence of risk factors that are shared between disorders, for example, working memory. However, it should not be assumed that all dyslexics have problems with mathematics, although the percentage may be very high, or that all dyscalculics have problems with reading and writing. This latter rate of co-occurrence may well be a much lower percentage.

AJ-Books-2-2400px Impact on Study:


  • Poor sense of number and estimation
  • Difficulty in remembering ‘basic’ facts, despite practice
  • Has no sense of whether any answers that are obtained are right or nearly right
  • Forgets mathematical procedures, especially as they become more complex, for example ‘long’ division
  • Addition is often the default operation. The other operations are usually very poorly executed (or avoided altogether)
  • Avoiding tasks that are perceived as difficult and likely to result in a wrong answer



  • Student tends to be slower to perform calculations
  • May often produce inaccurate work
  • High levels of mathematics anxiety – may avoid work – struggles meeting deadlines and with course participation, especially with assessment


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