Most teachers are aware of the aspects to be considered in the teaching of arithmetic, namely, the logical, social, and psychological. Both the logical steps and the social understandings are defined to a greater or a lesser extent in guides, manuals, and other curriculum sources. When the psychological phase is examined, however, the emphasis is upon technique rather than upon content. Here the teacher's skill, insight, and sympathy toward the learner, his problems and the hurdles he must overcome are of paramount importance.