In a test that measured the mathematics skills of 15-year-olds in 29 leading industrialized nations, the United States placed 24th, a number that is down from three years ago, when the United States placed in the middle of the rankings.
The United States has since fallen behind such countries as Hungary, Poland and Spain.
The Washington Post reported that the study, conducted by the Organization for Economic Cooperation and Development, placed students from Finland and South Korea at the top of the list with the highest scores.
Over 5,400 students in 262 U.S. schools were tested in 2003, as part of the over 250,000 students who were tested worldwide.
Theories about why the United States placed at the bottom of the rankings range from teacher shortages to insufficiently challenging math courses available to students.