From the BBC. It ranks US states against OECD nations.

US 'in denial' over poor maths standards

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Among children of parents with a low level of education, only 17% were proficient in maths, compared with 43% of children from well-educated families. But this standard of maths among well-educated families in US is well below their counterparts in other countries.

In Poland, 71% of children from well-educated families were likely to be proficient in maths. In Germany, 64% of better-off children were proficient at maths and 55% in France.

Even such a poor performance was unlikely to set off alarm bells, said Paul Peterson, report co-author and professor of government at Harvard University and director of the Program on Education Policy and Governance at the Harvard Kennedy School.

"There is a denial phenomenon," says Prof Peterson.