http://web2.0rechner.de/formelsammlung/mathematik/algebra/powers
$${{\mathtt{a}}}^{{\mathtt{6}}}{\mathtt{\,\times\,}}{\mathtt{5}}{\mathtt{\,\times\,}}{{\mathtt{a}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{\mathtt{8}}{\mathtt{\,\times\,}}{{\mathtt{a}}}^{{\mathtt{5}}} = {\mathtt{40}}{\mathtt{\,\times\,}}{{\mathtt{a}}}^{{\mathtt{13}}}$$
http://web2.0rechner.de/formelsammlung/mathematik/algebra/powers