LEXIBOOK PLC650 Manuel D'instructions page 4

3. Calculations using memory
Before saving a new value to the memory, the content must first be deleted by
pressing the 'MRC' key twice and then pressing the 'ON/C' key to delete all previous
calculations.
To add a value to the memory, enter the chosen number or calculation and then press
the 'M+' key. The result of the calculation is worked out and, if applicable, added to
the value in the memory.
When 'MEMORY' is displayed, it indicates that a value is stored in the memory.
To deduct a value from the memory, enter the chosen number or calculation, and then
press the "M-" key. The number entered (or the result of the calculation) is deducted
from the value stored in the memory.
In order to display the value stored in the memory press "MRC". To delete the
memory content, press twice on "MRC", the caption "MEMORY" will disappear.
4. Calculation review "AUTO REVIEW" & "CORRECT"
Calculations can be reviewed step by step. Prior to proceeding with the review of the
calculations, the latter must have been finalised. Keys ▼ and ▲ can be used for no
matter which calculation: additions, subtractions, multiplications, divisions,
percentage.
The ▼ key allows you to go back step by step to the first calculation, whereas the ▲
key takes you step by step to the last calculation. Press on "AUTO REVIEW" for an
automatic recall of all last calculations. Press on C/CE to stop the recall and return to
the screen before using the ▼ and ▲ keys.
To modify a calculation during the review, once the calculator displays the calculation
you wish to modify, follow the steps given next:
• Press on "CORRECT"
• Enter the new value or press the new calculation key or both.
• Press "CORRECT" again in order to validate the modification.
Proceed to the last step in order to check the new result. You can modify as
many steps as you wish as long as the "CORRECT" key is pressed once for edit the
calculation, and then again to finish editing it.
Notes: No additional step can be added while reviewing the calculations.
Should an error occur while a calculation is being modified, all steps will be
deleted from the memory and it will not be possible to review them.
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