public bool IsValid(int number)
        {
            var parts = NumberHelper.Split(number);

            return(parts.Item1 + parts.Item2 > 10);
        }
 public bool IsValid(int number)
 {
     return(NumberHelper.Split(number).Item1 == 3);
 }
 public bool IsValid(int number)
 {
     return(NumberHelper.IsPrime(NumberHelper.Split(number).Item2));
 }
 public bool IsValid(int number)
 {
     return(NumberHelper.IsPrime(number));
 }