WASHINGTON -- Results from national math and reading tests show slipping or stagnant scores for the nation's schoolchildren.
Math scores were down for fourth- and eighth-graders over the last two years.
And reading grades were not much better: flat for fourth-graders and lower for eighth-graders, according to 2015 results released Wednesday for the National Assessment of Educational Progress (NAEP) exam.
The falling mathematics scores for fourth- and eighth-graders mark the first declines in math since 1990.
The results suggest students have a ways to go to demonstrate a solid grasp or mastery in reading and math.
Only about a third of the nation's eighth-graders were at proficient or above in math and reading.
Among fourth-graders, the results were slightly better in reading and in math, about two in five scored proficient or above.
The report also found a continuing achievement gap between white and black students.
There were a few bright spots: the District of Columbia and Mississippi saw substantial reading and math gains.
Education Secretary Arne Duncan urged parents, teachers and others not to panic about the scores as states embrace higher academic standards, such as Common Core.
"We should expect scores in this period to bounce around some, and I think that 'implementation dip' is part of what we're seeing here," Duncan said in a phone call with reporters. "I would caution everyone to be careful about drawing conclusions."
Chris Minnich, executive director of the Council of Chief State School Officers, echoed Duncan.
"One year does not make a trend," Minnich said at a panel discussion Wednesday. "We set this new goal for the country of college and career readiness for all kids. Clearly, these results today show we're not quite there yet, and we have some work to do."
The Common Core standards were developed by the states with the support of the administration.
They spell out what students should know in English and math at each grade level, with a focus on critical thinking and less emphasis on memorization.
But they have become a rallying point for critics who want a smaller federal role in education and some parents confounded by some of the new concepts being taught.
The NAEP tests, also known as the "nation's report card," don't align completely with Common Core, but NAEP officials said there was "quite a bit" of overlap between the tests and the college-ready standards.
Among the findings:
Both measures were sharply higher than 1990 results.
At the eighth-grade level, reading improved only in West Virginia, up three points.
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