Instructional Video
Khan Academy

Khan Academy: Arithmetic and Pre Algebra: Solving Percent Problems

9th - 10th Standards
This video demonstrates how to find the base number when given a percentage and amount. Practice problems are available. [6:17]
Instructional Video
Math Playground

Math Playground: How Do You Find the Sale Price?

5th - 7th Standards
This video illustrates how to calculate the sale price of an item given the discount percentage.