Since 1 British Pound is equal to 6.36945621516 Brazilian Reais, we could say that n British Pounds are equal to 6.36945621516 times n Brazilian Reais. In other words, we could use the following formula:
Brazilian Reais = British Pounds x 6.36945621516
For example, let's say that we want to convert 2 British Pounds to Brazilian Reais. Then, we just replace British Pounds in the abovementioned formula with 2:
Brazilian Reais = 2 x 6.36945621516
That is, 2 British Pounds are equal to 12.7389124303 Brazilian Reais.