Keyboard Memory Function Keys The following table indicates the keyboard keys that correspond to Calculator's memory function display buttons. Display Button Key MC F4 or M key followed by C MR F5 or M followed by R M+ F6 or M followed by + M- F7 or M followed by - Additional topics: * Performing Arithmetic Functions * Entering Data from the Keyboard * Clearing the Displays * Using Memory * Undoing the Most Recently Performed Function * Exiting Calculator * Using Calculator's Menus * Overview of Calculator