Stage: 4 and 5 Challenge Level: 
The scale at the side tells you how you're doing.
Make sure you can justify the order that the scale shows to be correct.
Visualising. Generalising. Inequality/inequalities. Long problems. Number theory. Quadratic equations. Interactivities. Mathematical reasoning & proof. Patterned numbers. Manipulating algebraic expressions/formulae.
Published May 2001.
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NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk
