Long-Term Trend Assessment (1970-2025 Trends)

Since the 1970s, the National Assessment of Educational Progress (NAEP) has measured student performance in mathematics and reading through long-term trend (LTT) assessments across three age levels (9-, 13-, and 17-year-old students).

The 2025 LTT assessment includes results in mathematics and reading for approximately 15,000 age 9 students and 16,400 age 13 students.

• Scale scores represent the average performance of students who took the LTT assessment in mathematics and reading. Scores are aggregated and reported for the nation and groups of students based on gender, race/ethnicity, etc.
• Performance levels are reported as the percentages of students attaining specific levels of performance corresponding to five points on the NAEP long-term trend reading and mathematics scales (150, 200, 250, 300, and 350).