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This article in Science makes the case.

Here is the press release from Science:

Girls = Boys at Math

By David Malakoff
ScienceNOW Daily News
24 July 2008
Zip. Zilch. Nada. There's no real difference between the scores of U.S. boys and girls on common math tests, according to a massive new study. Educators hope the finding will finally dispel lingering perceptions that girls don't measure up to boys when it comes to crunching numbers.

"This shows there's no issue of intellectual ability--and that's a message we still need to get out to some of our parents and teachers," says Henry "Hank" Kepner, president of the National Council of Teachers of Mathematics in Reston, Virginia.

It won't be a new message. Nearly 20 years ago, a large-scale study led by psychologist Janet Hyde of the University of Wisconsin, Madison, found a "trivial" gap in math test scores between boys and girls in elementary and middle school. But it did suggest that boys were better at solving more complex problems by the time they got to high school.

Now, even that small gap has disappeared, Hyde reports in tomorrow's issue of Science. Her team sifted through scores from standardized tests taken in 2005, 2006, and 2007 by nearly 7 million students in 10 states. Overall, the researchers found "no gender difference" in scores among children in grades two through 11. Among students with the highest test scores, the team did find that white boys outnumbered white girls by about two to one. Among Asians, however, that result was nearly reversed. Hyde says that suggests that cultural and social factors, not gender alone, influence how well students perform on tests. ...