The 100th Day of School is an important milestone to celebrate in the classroom. If you are needing some new and fun ideas to use in your kindergarten classroom, check out this blog for some free 100th day of school activities. You can fill your entire day with counting, building number sense, reading, exercising and practicing fine motor skills. Grab everything from counting mats, pattern blocks, 100th day necklace, pocket chart centers, cup stacking, dressing up as 100 years old, and more.