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'More Numbers in the Ring' printed from https://nrich.maths.org/

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Try putting one of the numbers in any square to start with. What numbers could go on each side of it? When you add the numbers in two joined squares, what kind of number do you get?
You might like to print off these sheets of blank rings to help you try out some different numbers:
Sheet with 3-number rings
Sheet with 4-number rings
Sheet with 5-number rings
Sheet with 6-number rings