Since 1 Barbadian Dollar is equal to 0.5 United States Dollars, we could say that n Barbadian Dollars are equal to 0.5 times n United States Dollars. In other words, we could use the following formula:
United States Dollars = Barbadian Dollars x 0.5
For example, let's say that we want to convert 2.0 Barbadian Dollars to United States Dollars. Then, we just replace Barbadian Dollars in the abovementioned formula with 2.0:
United States Dollars = 2.0 x 0.5
That is, 2.0 Barbadian Dollars are equal to 1.0 United States Dollars.