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Cross Number Puzzles PDF - Kim Sutton’s Cross Number Puzzles includes 30 blackline masters at three levels that will challenge students in grades 2-5. These puzzles use addition and subtraction skills plus encourage algebraic thinking. The puzzles are set up in a unique way that allows students to work on scanning skills. The puzzles are self-checking. Also included in the set are answer keys for each puzzle. These puzzles are great seatwork tools that reinforce computation and algebraic thinking!