C: Tap to clear the displayed number.
MC: Tap to clear the memory.
M+: Tap to add the displayed number to the number in memory. If no number is in memory, tap to store the displayed number in memory.
M-: Tap to subtract the displayed number from the number in memory.
MR: Tap to replace the displayed number with the number in memory. If the button has a white ring around it, there is a number stored in memory.
The stored number remains in memory when you switch between the standard and scientific calculators.