However, by the time they reach middle school, only 32% are at or above a proficient level in math, according to the 2007 Nation's Report Card by National Assessment of Educational Progress, and they fall behind internationally.

FORBES: Magazine Article

The average scores were categorized at each grade level into four groups: below basic, basic, proficient, and advanced.

CNN: Report card shows U.S. students need to improve math skills

By third grade, children from low-income families who are not reading at grade level are six times less likely to graduate from high school than students who are proficient.

WHITEHOUSE: The White House