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Acalculia is an acquired impairment in which people have difficulty performing simple mathematical tasks, such as adding, subtracting, multiplying, and even simply stating which of two numbers is larger. The condition has substantial negative impact on the wellbeing and independence of those affected. Acalculia is distinguished from dyscalculia in that acalculia is acquired late in life due to neurological injury such as a stroke, while dyscalculia is a specific developmental disorder first observed during the acquisition of mathematical knowledge. The name comes from the Greek a- meaning "not" and Latin calculare, which means "to count".
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