DouKaku?

        static void Main(string[] args)
        {
            kuku(9);
            kuku(99);
            kuku(999);
        }

        static void kuku(int n)
        {
            int len = n.ToString().Length;
            int xLen = (n * n).ToString().Length;
            string    format = "{0, " + len + "} * {1, " + len + "} = {2, " + xLen + "}";

            for (int i = 1; i <= n ; ++i)
                for (int j = 1; j <= n ; ++j)
                    Console.WriteLine(format, i, j, i * j);
        }