public string ToDecimalString(int maxDecimalPlaces)
{
if (maxDecimalPlaces < 0)
{
throw new ArgumentOutOfRangeException("maxDecimalPlaces");
}
bool isNegative = Numerator < 0;
var numerator = isNegative ? Numerator.AsImmutable().Negate() : Numerator.AsImmutable();
var denominator = Denominator.AsImmutable();
mpz tail;
var integerPart = numerator.TDivQR(denominator, out tail);
var fractionalPart = mpz.Ten.AsMutable().Power(maxDecimalPlaces).Multiply(tail).TDivQ(denominator);
return((isNegative ? "-" : String.Empty) + integerPart + "." + fractionalPart.ToString().PadLeft(maxDecimalPlaces, '0').TrimEnd('0'));
}