Abstract
The purpose of this study was to research the effects of “box diagram method” as an
instrument for problem solving on relative values. Box diagram method is able to show
students the relationship between real quantities and values of ratio more clearly in
comparison with conventional number line method. Two fifth graders who had not learned
relative values participated in this study. They took five hours classes on relative values using
box diagram method. The result revealed that two students became to be able to express
formulas to lead to correct answers using box diagram. Moreover, they could solve applied
problems called type B in national assessment test for sixth graders.
