A central understanding in mathematics is knowledge of "math equivalence," the relation indicating that 2 quantities are equal and interchangeable. Decades of research have documented elementary-school (ages 7 to 11) children's (mis)understanding of math equivalence, and recent work has developed a construct map and comprehensive…

We compared the performance of senior psychology majors, introductory psychology students, and similarly aged individuals with no college psychology on seven different outcome measures including multiple-choice knowledge tests, attitudes, and open-ended scenarios requiring qualitative responses. On all measures, both senior psychology majors and…