Stage: 2 Challenge Level: 
You could cut out two rings from card if you haven't got any
jewellery to use to try things out.
Interactivities. Multiplication & division. Factors and multiples. Working systematically. Investigations. Visualising. Trial and improvement. Combinations. Practical Activity. Addition & subtraction.
Published March 1998.
Copyright © 2007. University of Cambridge. All rights reserved.
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