Good idea. Foreign currency might help to get the kids interested in learning about the world around them. Something that couldn't hurt in our geographically challenged nation.
Back in 1968 I lived in San Diego, California. In August my wife , I and my son (8 years old) visited Tijuana, Mexico. In the center of a small shopping center was a government currency exchange booth. My son wanted a couple of things he had seen in one of the stores we visited. I GAVE HIM SOME USA dollars to exchange for some Mexican bills and coin change so he could have the experience of the exchange and the purchase of the two things he wanted. A few years later, in Decatur, Illinois, my son discovered some of the Mexican currency, took the bills and coins to school for a "show and tell" in which he explained his Tijuana experience. He passed the bills and coins to other students in the class to examine. The teacher gave him an A+ and told me his presentation garnered more interest than any other presentation in the ten years she had been teaching! Two years later, he borrowed a few Canadian dollars from a small collection I had managed to acquire at face value. He borrowed? a few USA dollars, went to a local coin dealer, picked up some Canadian coins at 10% over face and did a "show and tell" presentation at a different school in Fort Myers, Florida with the same results. If you live near the border with Mexico or Canada, maybe your child would benefit doing a "show and tell" at his or her school Clinker
I've been trying to decide what to do with all the foreign coins I find when searching rolls. Sounds like a good solution.