http://web2.0calc.com/questions/second-post-of-latex
Here is how you type fractions with LaTeX
If you want to type in calculator on this site
Example: Type in 3/5 * 2/3 it will show \(\mathtt{\dfrac{\frac{3}{5}\times 2}{3}}\mathtt{=\dfrac{2}{5}=0.4}\)