PBS
Pbs: The Lowdown: u.s. Gun Homicides: Visualizing the Numbers
Explore firearm deaths in the United States in 2010 by type, race, and age group in this interactive from KQED. In the accompanying classroom activity, students are presented with a simple question: Is America a safe place to live? In...
The Math League
The Math League: Ratio and Proportion
This tutorial provides definitions and examples of ratios and proportions and features comparing ratios and converting rates.