+118723 You can put it straight into the onsite calc (home page)
$${\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{5}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}} = {\frac{{\mathtt{19}}}{{\mathtt{30}}}} = {\mathtt{0.633\: \!333\: \!333\: \!333\: \!333\: \!3}}$$
If you need to do it by hand then you have to get them all to a common denominator which is 2*5*3=30
If you want more explanation then just ask for it. 
+118723 You can put it straight into the onsite calc (home page)
$${\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}}{{\mathtt{5}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}} = {\frac{{\mathtt{19}}}{{\mathtt{30}}}} = {\mathtt{0.633\: \!333\: \!333\: \!333\: \!333\: \!3}}$$
If you need to do it by hand then you have to get them all to a common denominator which is 2*5*3=30
If you want more explanation then just ask for it.
