Try this
Console.WriteLine("Math.Ceiling(25.75) = {0}", Math.Ceiling(25.75));
Console.WriteLine("Math.Ceiling(25.45) = {0}", Math.Ceiling(25.45));
Console.WriteLine("Math.Floor(25.75) = {0}", Math.Floor(25.75));
Console.WriteLine("Math.Floor(25.45) = {0}", Math.Floor(25.45));
Console.WriteLine("Math.Round(25.75) = {0}", Math.Round(25.75));
Console.WriteLine("Math.Round(25.45) = {0}", Math.Round(25.45));