Harry Bergen-Murphy does not feel ready when he starts first grade, but by day 100 he has become an expert on several important things, including being a first-grader.

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?

When Leela's pet bunny chews on her candy mold, Leela needs to come up with a new, sweet project in honor of her teacher the night before her class's 100th-day celebration. Aligned to Common Core Standards and correlated to state standards.