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Standard calculator
C.CE: Tap once to clear an entered value or an error. Tap twice to clear an entire calculator operation.
Conv.: Change to the Currency convertor.
+/-: Change the sign of a displayed value.
R.CM: Tap once to enter the value stored in the calculator's memory. Tap twice to clear the memory.
M-: Subtract the displayed number from the memory
M+: Add the displayed number to the memory
Memory symbol 'M' the top right of a number appears when an overflow or other error is detected.
Error symbol 'E' the bottom right of a number appears when a number is in the calculator's memory.