NEC N341I Using Manual page 91

Calculating using the temporary memory
To calculate using the temporary memory for example 5 x (25 - 5):
Key in 25.
Press the key.
Key in 5.
Press .
The answer 20 will be displayed in the calculation field.
Press Softkey 1.
An M will be displayed to the left of the field.
Key in 5.
Press the key.
Press Softkey 2.
20 will be displayed in the field.
Press .
The answer 100 will be displayed in the calculation field.
Deleting a digit
To delete a digit, press CLR.
Deleting all digits
To delete all digits input, press and hold CLR.
Deleting a memory
To delete the memory, press .
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