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Pick a team to go first and have them pick a square. Give them a reasonable amount of time to solve it, they can discuss with each other. Check off who has it right and wrong. If they meet the standard for the square they picked, mark it with an "X" or "O" (or smiley face or rainbow or whatever else they want). If they don't make it, the other team can steal. Then the second team picks a square and the same thing happens again until someone wins. I need to see work on each person's paper that supports their answer, they can't just copy the answer from each other. They will usually work hard at making sure everyone on the team understands. It can get pretty heated by the end, it's usually fun.