What is 13/16-3/8?

answer is: 0.4375

$$\left({\frac{{\mathtt{13}}}{{\mathtt{16}}}}\right){\mathtt{\,-\,}}\left({\frac{{\mathtt{3}}}{{\mathtt{8}}}}\right) = {\frac{{\mathtt{7}}}{{\mathtt{16}}}} = {\mathtt{0.437\: \!5}}$$