Using "Return" over "Break" or a combination

When using the Switch statement, is using return instead of break or a combination of the two considered bad form?

while (true)
{
    var operation = Randomness.Next(0, 3);
    switch (operation)
    {
        case 0:
            return result + number;
        case 1:
            if ((result - number) > 0)
            {
                return result - number;
            }
            break;
        case 2:
            return result * number;
        case 3:
            if ((result % number) == 0)
            {
                return result / number;
            }
            break;
    }
}