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You might like to play Square It before working on this problem.
Can you describe how many steps left/right and how many steps up/down you need to take to go from one corner of a square to the next? And to the next?
Can you work out the area of the inner square and give an explanation of how you did it?
With one cut a piece of card 16 cm by 9 cm can be made into two pieces which can be rearranged to form a square 12 cm by 12 cm. Explain how this can be done.