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January 2010, Volume 41, Issue 1


Mathematics Skills of 17-Year-Olds in the United States: 1978 to 2004
Peter Kloosterman
Overall scale scores from the National Assessment of Educational Progress (NAEP) indicate that there was only minimal improvement in the mathematics performance of high school students between 1978 and 2004. Using recently released data from the Long-Term Trend (LTT) NAEP, this study describes the content covered on the LTT NAEP and the performance of 17-year-old students on that content.

Problems Dealing With Unknown Quantities and Two Different Levels of Representing Unknowns
Eugenio Filloy, Teresa Rojano, and Armando Solares
This article centers on studying the progress of algebraic syntax once students have surmounted initial obstacles found in the transition toward symbolic algebra. It specifically analyzes students’ progress concerning the operation on the unknown, when the latter is represented by an expression that involves a 2nd unknown.