Stage: 5 Challenge Level: 
Joshua from Immanuel Lutheran College and Rushaan & Spencer from the Cape Academy both sent us the completed proof sorter. Well done to all three.
Number theory. Logo. Inequality/inequalities. Arithmetic sequence. Manipulating algebraic expressions/formulae. Interactivities. Visualising. Practical Activity. Mathematical reasoning & proof. Generalising.
Published December 2001,January 2002.
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email: nrich@damtp.cam.ac.uk
