The setup menu
The setup menu controls how calculations are done and shown. Open it with 
and 
. 1 and 2 choose the display format: natural or linear. 3, 4 and 5 choose the angle unit. 6, 7 and 8 choose the number format of the answers. The down key shows the second screen. There, 1 and 2 choose mixed or improper fractions. 3 shows or hides the frequency column of the statistics mode. 4 chooses one or two functions in the table mode. 5 turns recurring decimals on or off. 6 chooses a dot or a comma as the decimal point. And 7 adjusts the contrast of the display.