Content coverage in the 8th-grade mathematics assessment, TIMSS 1999, 2003, 2007, and 2011 (percentages devoted to each topic)

1999* 2003** 2007** 2011**
Numbers 37% 30% 30% 30%
Data representation 13 15
Data and chance 20 20
Geometry 12 15 20 20
Algebra 22 25 30 30
Measurement 15 15

* Post assessment analysis of actual items used in assessment

** Target instructions to test developers

Source: Martin and Mullis (2001); Mullis et al. (2003); Mullis et al. (2005); and Mullis et al. (2009)

View the underlying data on epi.org.