interface implementation??

[hemantc87]

class Program
    {
        interface math
        {
            void one();
            void two();
        }
        class test : math
        {
            void math.one()
            {
               
            }
            void math.two()
            {
                
            }
            
         public void sort(math ob)
            {
                Console.WriteLine("enter number");
               //calculation
            }
        }

        static void Main(string[] args)
        {
            math ob = new test();
            test ob1=new test();

            ob1.sort(ob);
            
            
            Console.ReadKey();
        }
    }

one two functions didnt have anything to do...still is it the right way to implement the interface.but was it really required if the methods didnt have any implementation in them??