Students will identify an addition or subtraction sentence from each bar model. Then they'll add or subtract to find them missing sum or missing addend. There are even a couple of three addend models included! Numbers range from single digit to 25 + 10. Some models use pictoral representation of numbers, and others use the numbers. My students beg to play, and while playing they'll do more math operations in this simple game than they would on any worksheet. Instructions for Bingo included. After playing Bingo once, a few days later we reviewed again by racing to find answers. Both ways are a great review of Using Bar Models.