Stage: 3 Challenge Level: 
Rectangles are considered different if they vary in size or have different locations.
How many different rectangles can be drawn on a chessboard?
How many of the rectangles are squares?
What happens on an n by n board?
Factors and multiples. Visualising. Squares. Rectangles. Creating expressions/formulae. Interactivities. Divisibility. Generalising. Patterned numbers. Inscribed polygons.
Published September 2003.
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