A fun way for students to practice addition facts and, at the same time, stretch their reasoning skills as they figure out what numbers go in the blank squares. The puzzles can be used as homework, regular classroom work, a reward for those who finish work early, or as an activity in a math learning center. The resource includes 20 6x6 puzzles (1 per page). Please visit my TpT store for more puzzles: Evelyn Christensen Puzzles-Math-and-More.