I do not know how to change the mode on the calculator. i want it scientific but i am unable too.

Your calculator is configured to display results in Scientific notation
8*5=40=4.*10^(01). Exit scientific mode by resetting the calculator or changing the display mode to fixed or normal.

There is no equation solving mode (utility) on this calculator. Sorry.

Press MODE 1 to return to real (normal) computation mode or MODE 2 for complex computation.

I have done the calculation using the the shortcut key [x10^X] to enter the exponent,and I got the correct result.
I also did the calculation by explicitly typing the 10^10 factor and I obtained the correct result.
The syntax error may come from your using the minus - sign for subtraction rather that the change sign key (-)

You want to change the display mode. Press SHIFT MODE. Then press 6 and a number specifying the number of digits after the decimal point for fixed decimal notation, or 6 and 1 or 2 to specify one of the floating point modes.

You've got the display set to fixed decimal notation. To change it, press SHIFT MODE 7 to switch to a scientific notation or SHIFT MODE 8 and then 1 or 2 to switch to one of the norm display modes.

norm1 switches to scientific notation if the magnitude of the number is less than 0.01 .
norm2 switches to scientific notation if the magnitude of the number is less than 0.000000001 .

Below are simplified instructions. Skip any step you already know.

There are two ways to get out from the scientific or sci mode:

Press On.

Press the mode key a number of times until you reach the setup screen shown below.



Press the number key 3 and it will change the mode to Norm.

Or you can reset it as follows:

Press Shift Clr 3 = This will initialize the calculator.




SOURCE

I am not sure what you want because the mathIO mode IS THE ONE THAT DISPLAYS results as fractions.
You have two display modes: MthIO (with fractions, radicals) and LineIO (with decimals). Which one do you want?
To set MthIO press [Shift][MODE][1:MthIO]
To set LineIO, press [SHIFT][MODE][2:LineIO]

Concerning the scientific display mode.
Decimal numbers can be displayed in various formats, Fixed,Scientific, and Normal. If you do not want scientific display of results, just set the mode to Fix(ed) and specify the number of decimal digits. However if a number to be displayed (a result) is too small or too large IT WILL BE DISPLAYED in scientific format regardless of the mode you selected.

Press SHIFT MATH 2 to switch to the LineIO mode. You won't see fractions then. However, if magnitude of the number is too large or too small, the calculator will switch to scientific notation in order to fit into the display.

yes i have