Here's a cute 100th-day coloring page you can use to talk about the number 100. At our schools, we have a 100th day of school “celebration”. The kids make projects to share with their class and participate in activities focusing on the number 100. You can download this free printable coloring page and share it with your own kids.
Cupcake and Sprinkles 100th Day of School Activity Page
This would also be a fun activity page to practice counting, coloring and fine motor skills like gluing rice or glitter glue to each sprinkle. Have fun with it!