Stage: 3 Challenge Level: 
How many different ways can I lay 10 paving slabs, each 2 foot by 1 foot, to make a path 2 foot wide and 10 foot long from my back door into my garden, without cutting any of the paving slabs?
Counting. Shape, space & measures - generally. Patterned numbers. Generalising. Visualising. Sequences. Mathematical reasoning & proof. Tessellations. Combinatorics. Interactivities.
Published December 2000.
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