Students in Colorado and the rest of the country do much worse on a tough federal test than they do on state exams in reading and math, raising doubts about how much kids are learning.
The number of children who were proficient or better on state exams was pretty solid in 2005.
States have wide latitude to decide what it means that students have reached proficiency.
But a new analysis shows that on the National Assessment of Educational Progress, most states don't come close to matching up.
In Colorado, 89 percent of fourth-graders were proficient or better in math on the state test.
On the federal test, 39 percent were.
The size of that discrepancy and those in other states raises questions about whether states are setting lower standards.
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