# Rounds to zero. NOTE: Students identified as both SD and ELL were counted only once in overall, but were counted separately under the SD and ELL categories. SD includes students identified as having either an Individualized Education Program or protection under Section 504 of the Rehabilitation Act of 1973. The national results include both public and nonpublic school students. The national (public) and state/jurisdiction results include public school students only. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 Mathematics Assessment.