Casio SF-4990 Manuale Utente

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1. Enter the Calculator Mode.

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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.

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3. Press 

& to display the initial result (in this case, 5).

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4. Press 

& again to add 3 to the result (in this case, 5 + 3

= 8).

• 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 

.

If you enter a wrong value, press 

 and then enter the correct value.

If you press the wrong arithmetic operator key (

!, @, #, $), simply press the

correct key before entering anything else.

Whenever an error occurs, the indicator “E” appears on the display.

    E

 
               

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Using the Calculator