KenKen puzzles are a great way for students to work on addition/subtraction/multiplication/division skills in a fun, engaging way. You can learn how to solve a KenKen puzzle here http://www.kenken.com/howto/solve
“KENtertainment” is a new feature included in the weekly KenKen puzzles. These extra problems/brain teasers will give students an extra challenge.
You can get free KenKen puzzles each week by signing up here http://www.kenken.com/teachers/classroom