A recent study of 30 industrialized nations found that fifteen year old Americans do not have math knowledge or the ability to apply it.
The most recent Program for International Student Assessment, or PISA for short, showed only four countries: Italy, Greece, Turkey, and Mexico, faring worse than the US in math. In fact, the US math scores were worse than those of some countries considered non-industrialized, such as Estonia and Slovenia. The US's score is worse than it was the last time the test was administered, in 2003.
The top countries? Finland, Canada, Japan, and New Zealand.
Alas, the worst news may be about reading. The US test results were thrown out - because of errors in the reading exams introduced by the North Carolina firm that printed them.