Wells (Yoko, 1998, etc.) makes numbers fun and relevant to daily life in this longer than usual picture book. Emily’s teacher promises that her class will have a special celebration on the 100th day of school. Every day the children write a new number in their number books and Emily includes it in a story. Those one- or two-sentence stories tell about Emily’s lessons in school, the antics of her friends and family, and her thoughts and feelings as she lives through these hundred days. Each of the little stories says a lot in a few words: “Eloise is thirteen years old. She thinks she knows everything.” Some stories have specific references that children may not know, but Wells gives them context through the illustrations. For the number sixteen, grandpa and grandma play “Sixteen Tons” and the first line of the music and words dance above their heads. Wells’s ink and watercolor drawings of effervescent little animals with human characteristics are familiar to her readers and sure to bring a smile. The variety of the page design, bold colors, movement, and humor create interest and liveliness. Some numbers have a full-page spread; others share the page. Pages may have frames or borders filled with objects related to the story; others have color extended to the corners. Every page is filled with details, but the numbers stand out, as do the many counting opportunities, making this a delightful learning opportunity. It also fulfills a need for teachers who follow the well-known mathematical pedagogy program that the celebration describes. Delicious! (Picture book. 6-8)