This is a stem activity with real life applications. Students research the price of two precious metals. They determine the silver to gold ratio! Then, the analyze whether they think it is a good time to purchase that commodity. This is good for a scouting project, summer camp project, or a trip to the New York Mercantile Exchange. Use it for a math project, or in a math center, as well. It crosses over into geology, and geography, too. Some students might want to become a commodites broker?