Casio SF-4985ER - Manual (Page 82)

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PART 5 Calculator Functions
To perform constant calculations
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1. Enter the Calculator Mode.
3 qq 2 2. Enter the calculation, pressing the arithmetic operator
key twice. This will causes the “K” indicator to appear on
the display to indicate a constant calculation.
•
You can use this constant calculation technique for
addition, subtraction, multiplication, and division.
u 3. Press & to display the initial result (in this case, 5).
u 4. Press
& again to add 3 to the result (in this case, 5 + 3
= 8).
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You can repeat the above operation as many times as
you like. Each time you press
&, the previous result
obtained is added to, subtracted from, multiplied by, or
divided by the value to the left of the arithmetic operator.
•
To clear a constant calculation, press AC .
To correct errors in calculations
If you enter a wrong value, press C and then enter the correct value.
If you press the wrong arithmetic operator key ( !, @, #, $), simply press the
correct key before entering anything else.
About calculation errors...
Whenever an error occurs, the indicator “E” appears on the display.
The following conditions all result in errors.
•
When the number of digits in the mantissa of an intermediate or a final result
exceeds 10 digits.