Instructional Video
Khan Academy

Khan Academy: Reasoning Through Inequality Expressions

9th - 10th Standards
This video lesson shows how to reason with different given inequalities.
Instructional Video
Loyola University Chicago

Math Flix: Integers: Three Ways to Teach Opposites

3rd - 8th Standards
This QuickTime movie teaches three different ways to understand opposite integers - positive and negative numbers. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.