The lead question for this problem, "How many rectangles can you find in this shape?" is an ideal way to introduce children to consider the properties of rectangles. The aim is not to simply count the number of rectangles but to discuss what a rectangle is.

The problem also looks at whether the rectangles are similar.

For more discussion on the properties of rectangles, see this sheet.

Can you tell me what a rectangle is?

Did you know that a square is a special sort of rectangle? What is the difference between a square and a rectangle?

How many rectangles did you find in the shape? Which ones are the same and which ones are different?

How many squares did you find?