Correcting Entry Errors

You may occassionally enter an incorrect number or press an incorrect function key.

You can use the [ CLEAR ] key to remove these errors, but this also clears the display, cancels all operations, and clears scientific notation. In many instances, you can correct an error without these unwanted effects.


Correcting Numeric Entries

You can correct mistaken numeric entries using the [ <- ] or the [ CE ] key, provided you have not yet pressed an operation key such as [ + ] or [ - ].
  • When you use the [ <- ] key, the display is backspaced one character at a time to enable you to replace any digit or decimal point in the mantissa. You can also use this key to correct the exponent if you are entering in scientific notation.
  • When you use the [ CE ] key, the entire number entry is cleared but pending operations are not.
If you make an error while entering the mantissa of a number in scientific notation, you must correct the error before pressing the [ EE ] key. After you have pressed the [ EE ] key, you can make corrections to the exponent using the [ <- ] key or by entering new numbers over the incorrect numbers. The [ CE ] key cannot be used to correct only the exponent.

Correcting Pending Operations


You may be able to correct another type of mistaken entry, depending on whether the entry completes a pending operation.
  • If the incorrect entry has an equal or higher priority than the intended entry, you can immediately press the correct key and continue. The calculator will obtain the correct result.
  • If the incorrect entry has a lower priority than the intended entry, it may complete a pending operation. Even if you replace the incorrect entry, the calculator will obtain an incorrect result.
The examples below illustrate when you can correct mistaken entries involving a pending operation.

Equal Priority Example

Calculate 10.6 + 12.7 × 5.

Procedure

Press

Display

Clear display[ CLEAR ]D_McSSNB
Enter addition10.6 [ + ]D_vwAFhW
Incorrect ÷ does not complete pending +12.7 [ ÷ ]D_HfrrEq
Correct × replaces ÷, yields correct answer[ × ] 5
[ = ]		D_oa2ZcH

Lower Priority Example

Calculate 10.6 + 12.7 × 5.

Procedure

Press

Display

Clear display[ CLEAR ]D_McSSNB
Enter addition10.6 [ + ]D_vwAFhW
Incorrect minus completes pending +12.7 [ - ]D_5D6ELw
Correct × yields incorrect answer[ × ] 5 [ = ]D_vT1e9y


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