Useful Money

Today I learned that the equation for the graph of Gaussian distribution is printed on every German 10 mark bill.  I initially thought this couldn't be true, until looking it up for myself.  The bill was made honoring Carl Friedrich Gauss, the famous mathematician and scientist.

My idea is to use this concept to print money with useful information on it.  The one dollar bill could have basic unit conversions, the five could have summaries of algebra and geometry, the ten could have the names of all the past presidents, and the twenty could have a map of the United States with their corresponding postal abbreviations.