Casio FX-115ES Scientific Calculator How can I get more of an answer...my answer automatically rounds to 3 decimals but I need to see more of the answer??

Two alternatives:
Press SHIFT MODE 6 then a digit greater than 2 to specify the desired number of digits to the right of the decimal point. For example, of you select 3 the number will be displayed rounded off to 0.004 .
Press SHIFT MODE 9 2 to select the NORM2 mode.
Be aware that in any mode if the magnitude of the number drops below 10^-9 then the calculator will automatically switch to scientific mode. The calculator can't display more than nine digits after the decimal point---the display just isn't big enough.

Press SHIFT MODE 6 3 to set the display mode to Fix3. This will show all results with three digits to the right of the decimal point.

Press the S--D key to switch between decimal and fraction forms.

To convert a single result to decimal, press S--D. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.

To convert a single result to decimal, press the S--D key. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.

To convert a single result to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.

To convert a single value, press the S<>D key. To have all answers come out in decimals, press 2nd MODE 2 to select LineIO.

Increase the number of decimal digits in display.

1. Press [SHIFT][MODE] to access the {SETUP)
2. Enter the number (6) corresponding to option [6:FIX]
3. In screen that is displyaed, enter the number of decimal digits you want (2, 3, or 4). If you enter 0, all decimal numbers will be displayed as integers (rounded). If you enter 9, you will have long numbers but that is hardly ever necessary.
   

Press [SHIFT][MODE][6:FIX]. You are then prompted to enter a number between 0 and 9. The number you enter fixes the number of decimal digits your results will have. If you press 0 all numbers will be rounded. Setting two or three decimal digits should be reasonable for most situations.

Press [SHIFT][MODE] to open SetUp. Select [1:MathIO]
To convert a fraction to sa decimal and (maybe) convert back to fraction, use the [S<>D] key.