 25¢ coins in Quebec French are often called ("thirty cents") because of a series of changes in terminology, currencies, and exchange rates.After the British conquest of Canada in 1760, French coins gradually went out of use, and became a nickname for the halfpenny, which was similar in value to the French "sou".Spanish dollars and U.S. dollars were also in use, and from 1841 to 1858, the exchange rate was fixed at $4 = £1 (or 400¢ = 240d).