A little math and a lot of reassurance are tucked into a new idea for celebrating the hundredth day of school. Jessica's first-grade teacher asks each student to bring in a collection of 100 things to mark the the day. Jessica, who already worries about everything, from missing the bus to remembering her lunch money, adds this to her pile of anxieties. She stews about it during dinner. When morning finds Jessica still at a loss, her family springs into action: Dad brings ribbons, Jessica's sister barrettes; Mom finds screws, and Jessica's brother rocks, and so on, until Jessica has a bag of things to take to school. She comes up 10 short, but a note in her lunch from Mom with 10 kisses appended gives her just the right number. Energetic pen-and-ink squiggles and bright watercolors fill the pages with round-eyed figures and striped, dotted, and floral patterns as the groups of objects are described and counted. GraceAnne A. DeCandido