Gather as many pennies as you want and find the year stamped on each one of them. That’s the year a penny was made or "minted." Enter online all the years you find, and see your results on a bar graph showing which penny years lots of people found.
Related Activites from How To Smile
Try out the related activities listed below from 24/7 Science and other sources. Be sure to visit Howtosmile.org to find even more science and math activities on the web!