Stage: 1 Challenge Level: 
Start with three pairs of socks. Now mix them up so that no mismatched pair is the same as another mismatched pair.
Now try it with four pairs of socks. Is there more than one way to do it?
A poster of this resource is available here.
Working systematically. Addition & subtraction. Investigations. Visualising. Factors and multiples. Trial and improvement. Practical Activity. Interactivities. Combinations. Multiplication & division.
Published February 2000,January 2009.
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