Harley Harrison is easily the best math student in second grade; he is also the biggest tattle-tale. Harley keeps track of how many erasers Erwin chews and how many milks too many Luis has at lunch. His math comes in very handy as he totals up these weekly infractions and turns his reports in to his teacher.Then one Monday, Emma Jean, a new student, sits in the empty desk by Harley Harrison. First she helps Harley with his math?he cannot believe it! Then she writes the teacher a note about how much time Harley wastes getting drinks of water. She?s also a tattle-tale! Soon they?re using their math skills to tattle on each other every chance they get.Finally Harley and Emma Jean have to stop tattling long enough to work together on a math quiz and try to earn an extra 10 minutes at recess for the next four days. Can they do it?.