You’ve got to love extension methods

public static class Roundings
{
    public static decimal To2Dp(this decimal amount)
    {
        return Math.Round(amount, 2);
    }

    public static decimal To5Dp(this decimal amount)
    {
        return Math.Round(amount, 5);
    }

    public static decimal To6Dp(this decimal amount)
    {
        return Math.Round(amount, 6);
    }
}