After reading Whimsy Workshop's blog "Ducky Dodgeball" post, I was intrigued by her "putting it together" math activity. She had students reassemble a 100 chart. The chart had an error, so that early finishers would have another task. See her post: http://whimsyworkshop.blogspot.com/2013/06/ducky-dodgeball.html
I loved the idea! So I decided to make my own version on a 120 chart. Printed on colored paper (to keep the chart from getting mixed up), laminated, and cut apart to make puzzles, there are three errors on each chart (5 different versions), plus one chart without errors.