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'School Fair Necklaces' printed from https://nrich.maths.org/

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How will you record what you've found out? You might find it helpful to print out this sheet and to use colouring pens or pencils.

Is there any way of making sure you have them all?
If you cut out individual necklaces from the sheet, you can move them around and arrange them, which might help you find out if any are missing.