Dyscalculia is a condition that affects the ability to acquire arithmetical skills. Dyscalculic learners may have difficulty understanding simple number concepts, lack an intuitive grasp of numbers, and have problems learning number facts and procedures.
Dyscalculia is like dyslexia for numbers. But unlike dyslexia, very little is known about its prevalence, causes or treatment. People with dyscalculia experience great difficulty with the most basic aspects of numbers and arithmetic.
Somewhere between 3% and 6% of the population are affected.
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An introduction to dyscalculia by Jane Emerson.