What's summer without baseball? Lindsey, Arun, and Ladi are done with little league for the season, but the itch to play is still fresh in their minds. Maybe they can create their own baseball field--but where to start? Diamonds, squares, pentagons, right angles! What are they? With the help of the kindly Mr. Riley, the kids learn the precise angles and measurements to create their own field. (Math topic: angles)

With engaging stories that connect math to kids' everyday lives, each book in the Teachers' Choice Award-winning Math Matters series focuses on a single concept and reinforces math vocabulary and skills. Bonus activities in the back of each book feature math and reading comprehension questions, and even more free activities online add to the fun!