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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.
Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?