This is an incredibly simple game that my second graders LOVE! I put my students in pairs. Student #1 tries to find a pair of numbers (that are close to each other on the game board) that add up to the number given at the top. If a pair is found, he/she colors it (or circles it). I use a little sand timer to limit the amount of time each child gets to find a pair. When the sand runs out, Student #2 tries to find a pair of numbers that add up to the given number and color/circle them. Continue the game until all pairs are found. The student that found the most pairs is the winner.