01/06/2026
A new study suggests that one surprisingly simple difference between stronger and weaker math teachers may be how often they use mathematical vocabulary, words such as “factors,” “denominators” and “multiples,” in class.
Teachers who used more math vocabulary had students who scored higher on math tests, according to a team of data scientists and education researchers from Harvard University, Stanford University and the University of Maryland. The size of the test score boost was substantial. It amounted to about half of the benefit researchers typically attribute to having a highly effective teacher, which is among the most important school-based factors that help children learn. Students with highly effective teachers can end up months ahead of their peers.
“If you’re looking for a good math teacher, you’re probably looking for somebody who’s exposing their students to more mathematical vocabulary,” said Harvard data scientist Zachary Himmelsbach, lead author of the study, which was published online in November 2025. https://hechingerreport.org/proof-points-math-vocabulary/