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 third volume of I Can KenKen features:. 75 easy addition and subtraction puzzles . Introduction and how to solve instructions from Marilyn Burns . "Home and Classroom Guide for Parents and Teachers" by Ms. Burns . Forward by Will Shortz | Will Shortz Presents I Can KenKen Volume 3 by Tetsuya Miyamoto, Paperback | Indigo Chapters