- Thirteen-year-olds. In 2004, a higher percentage of students were enrolled in algebra (29) than in any previous assessment year. The percentage in pre-algebra (32) has also increased, while the percentage in regular mathematics classes has decreased since 1986.
- Seventeen-year-olds. A greater percentage of students (17) indicated they were taking or had taken calculus in 2004 than in any previous assessment year. The percentage taking second-year algebra also increased from 37 percent in 1978 to 53 percent in 2004. Conversely, the percentage of students who indicated that the highest level of mathematics they had taken was pre-algebra or algebra was lower in 2004 than in 1978.
- Mathematics course-taking. Background questions about students' mathematics course-taking were first asked of 13-year-old students in 1986 and first asked of 17-year-olds in 1978.
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