Stage: 2 Challenge Level: 
Why do this problem?
This
activity is one of the many that tackle the mathematical topic
of combinations.
Possible approach
text
Key questions
Tell me about the way you have worked out your
solutions.
Possible extension
text
Possible support
text
Practical Activity. Factors and multiples. Visualising. Combinations. Working systematically. Multiplication & division. Trial and improvement. Investigations. Addition & subtraction. Interactivities.
Published October 2001.
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