Samsung SPH-I300 - Manual (Page 212)

Calculator 209
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Using the Calculator Buttons
The calculator includes several buttons to complete the
mathematical calculations.
The “CE” button clears the last number you
entered. Use this button if you make a mistake
while entering a number in the middle of a
calculation. This button enables you to re-enter the
number without starting the calculation over.
The “C” button clears the entire calculation and
enables you to begin a fresh calculation.
The “Plus/Minus” button toggles the current
number between a negative and positive value. If
you want to enter a negative number, enter the
number first and then press the +/- button.