This calculator can display two results (main and sub). The sub value displayed at the top left can be used in the main calculation. You can switch easily between main and sub. Please forget about the old memory function. This is an evolved form of the memory function. The two values can be easily compared. There is no more need to write them down. Two special keys. 1. [A/B] key : Switch between main and sub 2. [A],[B] key : Use sub value The calculation history can be displayed in the blank