arithmetic method; computation method
Technical computing term referring to a specific method or scheme for performing arithmetic operations, such as in a processor or algorithm.
This CPU adopts a new arithmetic method.
演算 refers to arithmetic operations in general, while 演算方式 specifies the method or scheme for performing those operations.
計算方式 is a broader term for calculation methods, not limited to arithmetic operations in computing.
Compound of 演算 (arithmetic operation) and 方式 (method, system).