Since 1 US Dollar is equal to 1.3504 Singapore Dollars, we could say that n United States Dollars are equal to 1.3504 times n Singapore Dollars. In other words, we could use the following formula:
Singapore Dollars = United States Dollars x 1.3504
For example, let's say that we want to convert 2.0 United States Dollars to Singapore Dollars. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
Singapore Dollars = 2.0 x 1.3504
That is, 2.0 United States Dollars are equal to 2.7008 Singapore Dollars.