New statistics show that U.S. students are struggling to learn basic math. The 2009 results of the National Assessment of Educational Progress (NAEP) in math, a test given every two years to fourth- and eighth-graders nationwide, were released this week. Although average overall scores have doubled since the NAEP was introduced in 1990, results have completely flat-lined among fourth-graders, and the achievement gap between white and black students isn't narrowing.

 The New York Times notes that such trends could be linked to the enactment of No Child Left Behind (NCLB) in 2002:

They [the test results] show that scores grew faster during the seven years before the federal law’s enactment. During those years, average fourth-grade math scores grew by 11 points, to 235 in 2003 from 224 in 1996, and eighth-grade scores grew by eight points, to 278 in 2003 from 270 in 1996. In the six years since the law took effect, fourth-grade scores have risen by five points, to 240 from 235. Eighth-grade scores have risen by an equal amount, to 283 from 278. (emphasis added)