Average 8th-grade scale scores, U.S., by mathematics content area, TIMSS 1999, 2003, 2007, and 2011
| 1999 | 2003 | 2007 | 2011 | |
|---|---|---|---|---|
| Numbers | 509 | 508 | 514 | 514 |
| Data representation | 506 | 527 | ||
| Data and chance | 533 | 527 | ||
| Geometry | 473 | 472 | 480 | 485 |
| Algebra | 506 | 510 | 507 | 512 |
| Measurement | 482 | 495 |
Source: Mullis et al. (2000); Mullis et al. (2004); Mullis et al. (2008); Mullis et al. (2012)