Understanding the meaning of rational numbers and how to perform mathematical operations with those numbers seems to be a perennial problem in the United States for both adults and children. Based on previous work, we hypothesized that giving students more time to practice using rational numbers in an environment that enticed them to apply their…

Within the field of social studies education, disciplinary models of teaching, such as approximating a historian in asking students to "think historically," have been the emphasis of countless professional development and teacher education programs. This movement, however, has focused largely on the use of traditional primary documents and…