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The calculator is a finite device so it has to round off most numbers somewhere. However you have some control over where this rounding occurs. Press the MODE key. Cursor down to the second row and select the number of digits you want after the decimal point (or select "Float" to let the calculator decide, then press ENTER. Press 2nd QUIT to exit the mode screen.
First, bear in mind that the calculator is going to round numbers eventually, as it can only show a finite number of digits. You have some control over where and how this rounding takes place. Press [mode], down-arrow, down-arrow, then right-arrow to the choice of decimals desired. Press [enter] to select it.
To change the display, press 2nd then . and, when prompted, enter the number of digits you would like to see displayed. You must then press the Enter to lock in your choice. I would press 2nd.5Enter to display 5 decimal places or whatever number that you wanted. Then hit 2nd then CPT.
By default the BA-II Plus displays two digits to the right of the decimal point, for dollars and cents. To change the number of digits, press 2nd [FORMAT] and a digit from 0-8. Use 9 for floating decimal display.