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'Number Squares' printed from http://nrich.maths.org/

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You could try altering just one of your starting numbers to see what effect this has. Can you predict what will happen before you try it?
You could set yourself some targets for the middle numbers and see how close you can get.
What are the similarities and differences betweeen the different squares you produce?
Can you explain these similarities and differences?
You might find a calculator handy!