Add to problems are all about adding. There are three types (see Figure 4.1). The first type of add to problem is where the result is unknown (see Figures 4.2 through 4.11). For example: The cafeteria had 57 students in it. Then, 29 more students came. How many people are in the cafeteria now? In this problem, the result is unknown. Teachers tend to tell these types of problems. They are basic and straightforward. The teacher should start with concrete items, then proceed to drawing out the story, then to diagramming the story and, finally, to using equations to represent the story. The “results unknown” problem is the easiest type of story problem to solve.