Thanksrobphy said:possibly helpful: https://www.google.com/search?q=991EX+"significant+figures"+mode
The purpose of using a calculator in significant figures mode is to ensure that the results of calculations have the appropriate number of significant figures based on the precision of the input values. This mode helps to avoid rounding errors and maintain accuracy in calculations.
The method for activating significant figures mode may vary depending on the type of calculator, but most have a button or setting specifically labeled for significant figures. Consult your calculator's manual for specific instructions.
Significant figures mode should be used whenever precision is important in a calculation. This is especially useful in scientific and mathematical calculations where accuracy is crucial.
If you use too many significant figures, the result may appear to be more precise than it actually is. Using too few significant figures can result in a less accurate answer. It is important to use the appropriate number of significant figures for the given values to maintain accuracy.
Significant figures mode is most commonly used for multiplication, division, addition, and subtraction calculations. It can also be used for more complex operations, but it is important to be aware of the rules for determining significant figures in these cases.