Restklassenringe (Z)/mod 6/Additionstafel

$\begin{array}{ccccccc}+& 0& 1& 2& 3& 4& 5\\ 0& 0& 1& 2& 3& 4& 5\\ 1& 1& 2& 3& 4& 5& 0\\ 2& 2& 3& 4& 5& 0& 1\\ 3& 3& 4& 5& 0& 1& 2\\ 4& 4& 5& 0& 1& 2& 3\\ 5& 5& 0& 1& 2& 3& 4\end{array}$