HP 50g Graphing Calculator - Manual (Page 49)

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Press the !!@@OK#@ soft menu key to complete the selection:
Press the !!@@OK#@ soft menu key return to the calculator display. The number
now is shown as:
Notice how the number is rounded, not truncated. Thus, the number
123.4567890123456, for this setting, is displayed as 123.457, and not
as 123.456 because the digit after 6 is > 5
Θ Scientific format
The scientific format is mainly used when solving problems in the physical
sciences where numbers are usually represented as a number with limited
precision multiplied by a power of ten.
To set this format, start by pressing the H button. Next, use the down
arrow key, ˜, to select the option Number format. Press the
@CHOOS soft
menu key and select the option Scientific with the arrow down key ˜.
Keep the number 3 in front of the Sci. (This number can be changed in the