I Can Kenken!: Will Shortz Presents I Can Kenken! Volume 3 : 75 Puzzles for Having Fun with Math
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