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Not only are these puzzles fun but KenKen helps children improve concentration, logic and arithmetic skills. Children ages 9-12 have excelled in math and gained real-life problem solving skills all from playing a puzzle so engaging that it keeps them coming back for more.This first book of KenKen for Kids features:• 75 easy all addition puzzles to get kids excited about KenKen • Introduction and how to solve instructions from Marilyn Burns• "Home and Classroom Guide for Parents and Teachers" by Ms. Burns• Foreword by Will Shortz