Loyola University Chicago
Math Flix: Writing Ratios 2
This QuickTime movie gives examples of writing ratios. As you watch and listen to the teacher and students interact it helps clarify the thinking behind applying this concept.
Math Mammoth
Math Mammoth: Scaling Figures and the Scale Ratio
Explains what a scale ratio between two figures means and how to use it to calculate unknown side lengths. [8:31]