|Planet Dexter/Addison Wesley
This publisher creates many new activity books that are fun and unique. This one is terrific. A calculator is built in to provide secret messages, tricks and puzzles, weird numbers and mind bogglers that really work. The child learns to use the calculator, which is cut into the middle of the book on each page. The child learns how to calculate, do tricks, and play the games, so math becomes fun. Good work!