Restklassenringe (Z)/mod 8/Multiplikationstafel

$\begin{array}{ccccccccc}\cdot & 0& 1& 2& 3& 4& 5& 6& 7\\ 0& 0& 0& 0& 0& 0& 0& 0& 0\\ 1& 0& 1& 2& 3& 4& 5& 6& 7\\ 2& 0& 2& 4& 6& 0& 2& 4& 6\\ 3& 0& 3& 6& 1& 4& 7& 2& 5\\ 4& 0& 4& 0& 4& 0& 4& 0& 4\\ 5& 0& 5& 2& 7& 4& 1& 6& 3\\ 6& 0& 6& 4& 2& 0& 6& 4& 2\\ 7& 0& 7& 6& 5& 4& 3& 2& 1\end{array}$