$${{\mathtt{5}}}^{-{\mathtt{2}}}$$
$${\frac{{\mathtt{1}}}{{{\mathtt{5}}}^{{\mathtt{2}}}}}$$
$${\frac{{\mathtt{1}}}{\left({\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{5}}\right)}}$$
$${\frac{{\mathtt{1}}}{{\mathtt{25}}}}$$
.$${{\mathtt{5}}}^{-{\mathtt{2}}}$$
$${\frac{{\mathtt{1}}}{{{\mathtt{5}}}^{{\mathtt{2}}}}}$$
$${\frac{{\mathtt{1}}}{\left({\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{5}}\right)}}$$
$${\frac{{\mathtt{1}}}{{\mathtt{25}}}}$$