Rocket the dog is excited about the 100th day of school and enlists the help of his friends to collect one hundred special things to bring to class, from heart-shaped stones found with Mr. Barker to feathers Owl provides, but will he find enough items in time?

Hannah looks forward to Robin Hill School's celebration of one hundred days of classes, but when a cold keeps her home the day of the party she decides to bring in the one hundred buttons she found anyway.

Mama helps Stinky Face discover one hundred things he can bring to school that are special to him.

In their fourth adventure, classroom mice Fergus and Zeke--after a few false starts--jump into a creative project to help the kids mark the one hundredth day of school. Fergus and Zeke love being the class pets in Miss Maxwell's classroom, and they do everything the students do. But when the kids start collecting items and doing gym challenges and making projects to celebrate the one hundredth day of school, the mice can't seem to find a way to join...

It's no ordinary day in Miss Mingo's classroom: it's the 100th day of school! Everyone has prepared 100th Day projects. There are many ways to get to the number 100, and the students in Miss Mingo's class demonstrate all kinds of combinations: ten sets of ten, two sets of fifty, five sets of twenty, and more. With animal facts peppered in among the festivities, every creature in class has a chance to show off their knowledge and discover something...