(from the Greek “a” – negation and Latin – for arithmetic) is the inadequacy of a person in counting and arithmetic operations, It is caused by damage to different nerve areas in the cerebral cortex. There are forms of arithmetic dysphasia, Of which: visual-spatial dyscalculia resulting from damage to the posterior parietal temporal nerve regions, And sensory and auditory visual dyscalculia and memory resulting from injury or immaturity of the nerve region No. (22), Anterior dyscalculia resulting from injury or immaturity of the frontal cerebral region. Initial arithmetic manifests itself as difficulty in understanding the positional structure of numbers (for example, recognize numbers 41 and 14 as identical), Understand the meanings of arithmetic marks and difficulties in counting and arithmetic, Secondary forms may include difficulties in oral counting due to disturbances in auditory perception of numbers, and the difficulty of distinguishing between similar numbers while maintaining the positional structure of the number, Poor planning of calculations and general activity, random correlations, and lack of control in counting and calculations due to disturbances in purposeful selective intellectual activity.