Instructional Video
Virtual Nerd

Virtual Nerd: How Do You Find the Area of a Rectangle?

4th - 5th Standards
Explains how to calculate the area of a rectangle using the formula where area equals length times width. [2:56]
Instructional Video
Khan Academy

Khan Academy: Measuring Area With Partial Unit Squares

3rd Standards
Models how to find the area of a shape on a grid that has different angle sizes by counting both square and partial units. [3:16]