Lesson, Publisher, Math Snacks, Video, YouTube
Ratey pops up when you least expect him. And he can't resist pointing out the rates and "purrportions" in daily life. You'll never again overlook how everyday decisions rely on mathematical reasoning about rates.
See the Alternative Link for lesson resources.
16 July 2014 Edit: 17 July 2015
User submitted, thanks to Quyen Nguyen