We plan on asking for 25 pennies each. Each class puts all their pennies into the jars. The classes then compete to see which class can finish with the most pennies in their jars, each penny being worth one point. 2nd place class gets doughnuts for the whole class. 3rd place class gets timbits for the whole class.
Students can try to win in two different ways.
In my brother's elementary school there are just over 850 students. I'm also assuming that as the week draws to a close students will bring in silver money in attempts to win. We plan on having one in two weeks time and another in June. The pizza is available to us at a reduced cost. We're hoping the students will get very competitive and we can make even more.