The 100th Day of School is coming up sometime in the next month (at least here in the States) depending on when your district started school. In my second grade class, we spent the entire afternoon working on 100s day centers. They were math, literacy and social studies centers. I've made some of the activities from my centers into a freebie. Click on the picture below if you need a few more ideas for your class on the hundredth day of school.