The National Assessment of Educational Progress numbers show the regression hit minority students the hardest.
The test, also known as "the nation's report card," takes a snapshot of 9-year-olds (3rd-graders) pre- and post-pandemic.
In reading, kids dropped 5 points, the biggest drop since 1990.
In math, kids dropped 7 points. It's the first time since the testing began in the 1970s that there has been a drop at all.
The tests were given to a national sample of about 15,000 students. Experts said low-income and minority students were hit the hardest.
In reading, Black and Hispanic students lost 6 points. White students lost 4 points.
In math, Black students lost 13 points while Hispanic students lost 9 points. White students lost 6 points.
Experts said school closures led to the loss of in-person learning, which tended to happen longer in big cities and low-income areas. They said that 1 point is roughly equal to 3 weeks of learning. So, a student who lost 13 points would need roughly an entire school year to make it up.
More pandemic scores for different grade levels will be released in the weeks to come.
If you'd like to generate your own graphs by selecting different criteria and demographics, click here.