where can I press to make a scientific notation

On this site's calculator, just press "Enter" again after the answer appears, and the calculator will put it into scientific notation. http://web2.0calc.com/

You can also write an answer in scientific notation yourself by putting one digit before the decimal point, the rest behind the decimal point, and the number multiplied by 10 to the power of however many digits it takes to make the number.

Ex: 12345 = 1.2345 * 10⁴

Thanks Kitty, I didn't know that.

Do you know how I can do it if I use the math(Input=Result) button in the forum?