On the first day of school, Emily's teacher, Miss Cribbage, tells the class that they will make a new number friend every day for the first 100 days of school. Everyone will have a number book in which to write numerical discoveries and musings. Eager Emily dives right into the project. On the second day of school, Miss Cribbage teaches a song called "Tea for Two." On day three, Emily writes about her school bus, No. 3. In square dancing, Emily learns that there are four corners to a dancing square. She picks five different vegetables from her garden for her father to use in his tomato-zucchini-pepper-carrot-eggplant soup. From day one to day 100, Emily and her classmates expand their creative and mathematical skills as they immerse themselves in the exciting early days of school.