Use the buttons to perform different mathematical operations. The available functions are: - Addition (+) - Subtraction (─) - Multiplication (×) - Division (÷) and Square Route (√) If the calculator displays 'Error' then it's likely that the screen is not big enough for all the digits in the number it is trying to display. (Numbers with over 8 digits cannot be displayed. 'Error' appears when this is encountered.) Negative numbers aren't supported, although I may try to add this feature. I've recently improved the refresh rate of the screen as before there was a delay with digits appearing.
