This video tutorial teaches how to find the perimeter of squares and rectangles by adding side lengths. It explains the concept of equal side lengths, differentiates between area and perimeter, and provides methods for calculating perimeter using number sentences and mental math. The tutorial includes examples for both rectangles and squares, emphasizing the importance of understanding side lengths and avoiding common mistakes.

Explain how to calculate the perimeter of a rectangle using mental math.

What is the perimeter of a garden that is a square with each side measuring 2 units?