Recently I was talking with some friends who are also Math teachers and I had given them some puzzles to use in class. They were telling me that the kids were totally confused about matching the problem to the answer and the 16 squares( which in the simple version require solving 24 problems) seemed overwhelming to them. Now these students are in high school my students are in middle school, so I think I assume that anything my middle school students could do that high school students should be able to do a little bit faster and better. Maybe not necessarily.
I labeled the puzzles 1, 2, 3, 4 so that they could be printed, cut out and sorted according to which puzzle they belonged. And then the pieces could either be paper clipped or put in an envelope to pass out to students as they enter.
If you are interested in using these puzzles or using them as a template for making your own puzzles, they are available here: 2 x 2 Puzzles 3 x 3 Puzzle