Setting fraction precision
2.Select Number Format, press 
to display the options, and highlight Fraction or Mixed Fraction.
3.Press 
to select the Number Format option, then move to the precision value field.
4.Enter the precision value that you want to use, and
press 
to set the precision. Press 
to return to HOME.
See “Setting fraction precision” below for more information.
The fraction precision setting determines the precision in which the HP 39gs converts a decimal value to a fraction. The greater the precision value that is set, the closer the fraction is to the decimal value.
By choosing a precision of 1 you are saying that the fraction only has to match 0.234 to at least 1 decimal place (3/13 is 0.23076...).
The fractions used are found using the technique of continued fractions.
When converting recurring decimals this can be important. For example, at precision 6 the decimal 0.6666 becomes 3333/5000 (6666/10000) whereas at precision 3, 0.6666 becomes 2/3, which is probably what you would want.
For example, when converting .234 to a fraction, the precision value has the following effect:
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