We recently passed the 100th day of school. We read books that used the number 100. We made necklaces with 100 fruit loops. We sorted the cereal into groups of 10 by color, made 10 sets, then strung them.
While we were at lunch our paraprofessional stayed behind to put stickers that had been numbered 1-100 around the room. As they found the stickers, they had to come find that number and put it on our 100's chart. They really liked this.
I recently saw where one class celebrated the 101 day by dressing like dalmations and watching the movie.
If you have fun ideas for 100's day please share them.