ABSTRACT
Add to problems are all about adding. There are three types. The first type of add to problem is where the result is unknown. In this problem, the result is unknown. 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. The second kind of add to problem is the change unknown problem. In this type of problem, the students are looking for the change. They know the start and they know the end, but they don't know the change. The third type of add to problem is a start unknown problem. In this type of problem, the students are looking for the start. This is the hardest type of add to problem to solve, and it takes a great deal of modeling.
