Celebrating the 100th day of school is a big deal in kindergarten, with kids often collecting 100 items to practice counting to 100, or making a shirt with 100 things on it to commemorate the day. My daughter collected 100 beads (like in this post with ideas for things to collect from KC Edventures), and they made 100 day trail mix (similar to the one found in this post from Megan Zeni, but you can use any 10 items you have at home or can easily get for a group). Here’s another trail mix recipe with printable mat from Playdough to Plato.
If you’re looking for shirt ideas, Kindercraze has a ton of ideas in their 100th day of school fashion show post. There’s also a printable kids can decorate and wear as a hat or use as a sign.
One Giggle Classroom has a fun collection of 100th day activities, including printables, a song and activity ideas. I love the idea of using an aging app to see how kids might look at 100, and, if you have a long hallway or can do it outside, measuring distance with 100 kids.
Lessons 4 Little Ones has some great ideas for 100th day snacks, math activities, estimating which container has 100 items in it, coloring projects and more. You can plan your whole day with just these fun ideas.