Upper level: b189 Specific mental functions, other specified and unspecified
(Calculation function)
Specific mental functions of determination, approximation and manipulation of mathematical symbols and processes.
Inclusions: functions of addition, subtraction, and other simple mathematical calculations; functions of complex mathematical operations
Exclusions: attention functions (b140); memory functions (b144); thought functions (b160); higher-level cognitive functions (b164); mental functions of language (b167)
Lower livel: