6:57 How to Find the Area of Rectangles and Squares | Math with Mr. J
Exactly on topic: worked examples finding the area of rectangles and squares.
Area and perimeter - squares and rectangles
Calculate the perimeter and area of squares and rectangles
5 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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5 shown 6:57 
17:49 Area and Perimeter
Thorough worked examples of area and perimeter for rectangles and squares.
10:26 Math Antics - Area
Clear, engaging explanation of what area is and how to calculate it for rectangles.
2:06 Area of a Rectangle - Corbettmaths
Short UK Corbettmaths clip showing how to find the area of a rectangle.
5:32 GCSE Maths - How to Find the Area of Rectangles, Parallelograms, Triangles and Trapeziums
Crisp UK GCSE explainer of area formulas, starting with the rectangle.