+ 0 1 2 3 4 5 6 7 0 0 1 2 3 4 5 6 7 1 1 2 3 4 5 6 7 0 2 2 3 4 5 6 7 0 1 3 3 4 5 6 7 0 1 2 4 4 5 6 7 0 1 2 3 5 5 6 7 0 1 2 3 4 6 6 7 0 1 2 3 4 5 7 7 0 1 2 3 4 5 6 {\displaystyle {\begin{array}{c||c|c|c|c|c|c|c|c|}+&0&1&2&3&4&5&6&7\\\hline 0&0&1&2&3&4&5&6&7\\1&1&2&3&4&5&6&7&0\\2&2&3&4&5&6&7&0&1\\3&3&4&5&6&7&0&1&2\\4&4&5&6&7&0&1&2&3\\5&5&6&7&0&1&2&3&4\\6&6&7&0&1&2&3&4&5\\7&7&0&1&2&3&4&5&6\\\end{array}}}