Dr. Tim McNamara introduced us to Ken-Ken Math Puzzles. The puzzles are similar to Sudoku puzzles. Some examples can be found at the following websites:
http://thinkmath.edc.org/index.php/Introducing_KenKen_puzzles
http://illuminations.nctm.org/ActivityDetail.aspx?ID=189
http://www.kenken.com/
http://www.kenken.com/howto/solve
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