Eighth-graders who received more than seven hours of mathematics instruction per week (276) scored lower than those who received less instruction (279, 287, and 285 respectively).
NOTE: The NAEP Mathematics scale ranges from 0 to 500. Some apparent differences between estimates may not be statistically significant. See complete data.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Mathematics Assessment.