Inability to solve simple arithmetic problems.

Inability to perform mathematical computations.

The inability to perform simple problems of arithmetic.

a lack of ability to understand or use arithmetic symbols or functions (see dyscalculia).

an acquired deficit that limits performance of basic arithmetic computations

a total loss of the ability to do mathematical calculations; not caused by anxiety or an impairment in concentration. May occur with a neurological deficit or learning disorder

inability to do simple arithmetic.

Acalculia (not to be confused with dyscalculia), from the Greek "a" meaning "not" and Latin "calculare", which means "to count", is an acquired impairment in which patients have difficulty performing simple mathematical tasks, such as adding, subtracting, multiplying and even simply stating which of two numbers is larger. Acalculia is distinguished from dyscalculia in that acalculia is acquired late in life due to neurological injury such as stroke, while dyscalculia is a developmental disorder first observed during the acquisition of mathematical knowledge. This condition is associated with lesions of the parietal lobe (especially the angular gyrus) and the frontal lobe and can be an early sign of dementia.