acalculia

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 meaning "not" and Latin , which means "to count".

==Signs and symptoms== Calculation impairments include the inability to perform simple mathematical operations, such as addition, subtraction, division, and multiplication.