After completing the calculations to arrive at an answer, many students stop completely. Even after all of their previous preparation, students often report their answer as a naked number, say 36. Without units, 36 is a meaningless value, so answers must always include the unit of measure. In addition the answer should be framed in the context of the problem. 36 inches: Is that average height of girls in a kindergarten class or is 36 mm the average difference in height between boys and girls in that same class? The answer should make sense, too. When reflecting on the solution, students must be encouraged to ask themselves, "Is this answer possible?" If the answer reached is that there is a 36-inch difference between heights of boys and girls in a kindergarten class, something went wrong.