Use Math.Round
using System; public class MainClass { public static void Main() { Console.WriteLine(Math.Round(4.4)); Console.WriteLine(Math.Round(4.5)); Console.WriteLine(Math.Round(4.6)); Console.WriteLine(Math.Round(5.5)); Console.WriteLine(Math.Round(4.54, 1)); Console.WriteLine(Math.Round(4.55, 1)); Console.WriteLine(Math.Round(4.65, 1)); Console.WriteLine(Math.Round(4.56, 1)); } }