I need to know how to divide, mutiply, add, and substract in scienctific notation on my Casio fx-300ES

If you mean notation with subscripts as in matrix elements and vector components the calculator does not implement it. Sorry.

Sorry to disappoint you but this calculator does not do windows. The operation you require is truly basic so as to be done by hand. It will be simpler for you if you tried to understand the scientific notation.

All you need to know is how to enter a number in scientific notation. As to the operations you do them the usual way: For example, to multiply you enter a number (in any notation) press the multiplication key then enter the second number (in any notation) and press the = sign to get the result.

The problem is that the result may not be in scientific notation format. But for that you can configure the calculator to always show results in scientific format. Here is how to force that. Press [SHIFT][MODE] to enter (SetUp). In the screen that displays enter the number for the option SCI. You will then be prompted to specify the number of decimal digits. You will enter a number between 0 and 9. If you select 0 you will not have decimals in the result, and if you enter 9 you will have 9 decimals. What is the appropriate number of decimal place to keep in the FINAL result will depend on the number of significant digits in the measuremnets.

To enter a number in scientific notation (ex: 6.25x10^(-4))
You enter the so-called mantissa 6.25
You press the key at the bottom of keypad that is marked as [X10^x]
You enter the change sign (-) followed by the exponent 4

If your calculator is in MathIO you will be able to verify that what was entered is exactly what was neant. In MathIO, you move cursor up or down using the Up or Down arrow. When you finish entering the exponent you use the right arrow to bring cursor to the main level.

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

Press SHIFT MODE 2 to select LineIO mode. Now all results will come out in decimal form.

Press the [SHIFT][MODE] to access the (SETUP) screen. -See the screen capture below. Press [7:Sci] to select the output display format to be Scientific.
You will then be prompted to key in a number between 0 and 9 to choose the number of decimal digits.

If you do not want fractions nor radicals set the default Input/Output format to LineIO.
To do so press [SHIFT][MODE][2:LineIO]. After that perform the steps given above to select Scientific format for the output.

You have a key marked [x10^X] located on the bottom row of keys.
Example: To enter 6.02x10^(23)
6.02[x10^X] 23 [=]
If you have a negative exponent, use the change sign key [(-)]

Hello,
Press [SHIFT][MODE][6:Fix] and press a numbetr between (0--9). The number you select will be the number of decimal places your results have.
However if a result is smaller than 0.001 it will be in scientific notation.

Hope it helps.

'shift' 'mode' 'v' (down-arrow) '4' (select 'Disp') '1' (select 'Dot')

Multiply it by 180 and then divide by PI.