This book features problems that require insight and reasoning, problems that make calculations easier with clever techniques, and problems that enrich number sense, all solvable with basic integer arithmetic (addition, subtraction, multiplication, and division). This book is a compilation of a series from the abacus information magazine "Monthly Sunrise." Publisher: Nitto Shoin Honsha (August 1, 2004) Condition: The cover has some scratches and shows some wear, but the text is clean with no writing or highlighting. We have thoroughly checked the book, but please understand that as a used item, there may be minor overlooked scratches, stains, or markings.