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Dyscalculia is a lesser known disability, similar and potentially related to dyslexia and developmental dyspraxia.
The term refers to an impairment of the ability to solve mathematical problems, usually resulting from brain dysfunction. It occurs in people across the whole IQ range, and sufferers often, also have difficulties with time, measurement, and spatial reasoning.
Although some researchers believe that dyscalculia necessarily implies mathematical reasoning difficulties as well as difficulties with arithmetic operations, there is evidence that an individual might not be able to manipulate the numerals in addition, subtraction, multiplication and division (or dyscalculia), with no impairment of, or even giftedness in, abstract mathematical reasoning abilities.
Dyscalculia can be detected at a young age and measures can be taken to ease the problems faced by younger students in the same way that dyslexia can be dealt with by using a slightly different approach to teaching. However, dyscalculia is the lesser known of these learning disorders and so is often not recognized.