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KenKen Classroom Puzzles That Make Math Fun
Find this brain teaser, Let's Trace! (and its answer) in this puzzle set: http://www.kenkenpuzzle.com/misc/kkcr/tfxpybbvkdbtiwqilbstlphlyhzqwskscyrgspetgesxqagslh
Any educator can join for free. Puzzle sets are sent every Friday. A set consists of a variety of levels and sizes that are appropriate for all ages/grade levels.