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Press the simplify button.
The answer depends on the calculator. Some calculators have a button that allows you to toggle between various forms.
That function depends on the calculator's capabilites. Some calculators do not show fractions. They only represent fractions as a decimal value (e.g. 50% is represented in the calculator as .5). If your calculator has a fraction function, you can enter 50% then press the fraction button & it will display 1/2 (which is the lowest fraction for 50%).
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Most likely, it means Standard Deviation. which is used in analyzing a set of data. See related link.* * * * *The Casio range, popular with GCSE and A level students in the UK, has a button marked SD. This is a toggle between decimal (D) and standard (S) form (fraction, pi).