The third in a series of math challenge word problems. It is appropriate for grades 4 and up. I know teachers who use them in high school. I use this in my fourth grade class when students finish their classwork early. These questions combine visual perception with geometry and easy math calculations. In one, they must determine the opposite side of an unfolded cube. In the second, they must determine how many hands students will shake when they meet each other. An answer key is included.