Are falling US math scores concentrated among the lowest-performing students?
Core argument: US math scores on the 2023 Trends in Mathematics and Science Study fell 18 points for fourth graders and 27 points for eighth graders versus 2019, on a scale where 30 points roughly equates to a year of learning.
2023 scores from the Trends in Mathematics and Science Study (TIMSS)—an international assessment measuring fourth and eighth graders in math and science—offers a fresh look at the academic performance of US and international students. The results are grim. The pandemic harmed student achievement. Between 2019 and 2023, US math scores cratered, dropping by 18pp for fourth graders and a whopping 27pp for eighth graders—huge declines on a scale where 30 points roughly equates to a year of learning. In science, declines weren’t statistically significant but were in the same direction. The lowest performing students were hit hardest. Looking beneath the averages reveals how students across percentiles fared in both grades and subjects, and the patterns—though not all statistically significant—are consistent and compelling. In fourth-grade math, the scores of students below the 50th percentile dropped precipitously while the 75th and 90th percentile hardly moved at all.


