Since 1 Canadian Dollar is equal to 0.724453942840584 US Dollars, we could say that n Canadian Dollars are equal to 0.724453942840584 times n US Dollars. In other words, we could use the following formula:
US Dollars = Canadian Dollars x 0.724453942840584
For example, let's say that we want to convert 2.0 Canadian Dollars to US Dollars. Then, we just replace Canadian Dollars in the abovementioned formula with 2.0:
US Dollars = 2.0 x 0.724453942840584
That is, 2.0 Canadian Dollars are equal to 1.448907885681168 US Dollars.