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Thanks to all who sent in solutions. Here are some from Oakley School and St. George's school. This is what Emily sent us;
Ben, Hannah & Scott sent in these thoughts;
Otis, Jason & Sophis sent their solutions for 600 legs;
EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.
Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?