When I cube roots it gives me a decimal instead of a root answer how do I convert or fix this?

Change the output display to MathIO. You may be able to display square roots only: so no cube roots, nor fourth...

To convert from a radical to its decimal representation, press the [S<>D] key.

Sorry, but the fx-115ES can only display square roots in radical form. Cube roots are beyond its symbolic capabilities and will always be in decimal form.

Press 2nd then F--D key(its means left arrow key or left key from zero)

The capability of these calculators to handle irrational numbers in radical form is limited to square roots. Roots of index other than 2 are always displayed in their decimal representation.
If the calculator IO mode is set to MathIO, square roots will be displayed with the radical symbol. More complicated expressions with square roots might not be preserved and will be given as decimal numbers.

If you mean the cube root of 8, press
MATH 4 8 ENTER
and you will get 2.

If you're trying to calculate something else or using a different key sequence, please reply to this post and give further details.

It can handle square root but if result requires too much display space it will be displayed as a decimal.As to higher order roots such as cube , 4th and higher they are displayed as decimal. Sorry, there is nothing you can do about it.

Instead of hitting enter, hit diamond, then enter. The calculator will then give you a decimal approximation. Alternatively, you can go to F2, approx( and enter in the root you need approximated. Another method is to go to the MODE page and scroll down to Exact/Approx and change it to approx. That way it will work the same as a TI-83/84 and always give a decimal answer.

Configure the calculator to be in MathIO.
Press [Shift][Mode] to open (SetUp) screen.
Select [1:MthIO].

When in this mode, you can still convert a radical/fraction result to decimal by pressing the [S<->D] key.

To convert a single value to decimal, press Diamond then ENTER. To get them all that way, press MODE then F2. Scroll down to Exact/Approx and change it from Auto or Exact to Approximate.