Working in pairs, each student gets a piece of graph paper and three balloons. They both draw one quadrant and label, then draw three balloons somewhere in that quadrant. Students take turns guessing points and marking their opponents guesses. When one player guesses all the points the balloons covers, they get to pop one of their balloons. Whoever pops all their balloons first wins. You can also do this outside with water balloons during the warmer months.