Motorola A925 - Manual (Page 101)

Personal Organiser Features - 101
Calculator
To open the calculator, tap in the Application Launcher.
Use the calculator by tapping the on-screen keys. The calculator
has the following memory keys:
Key Description
mr+ Tap to store a number in memory.
mr- Tap to subtract a number from the number in
memory.
mr Tap once to retrieve a number from memory and
enter it into the display.
Tap twice to clear memory.