Stage: 2 Short Challenge Level: 
Find the next number in this pattern.
Generalising. Multiplication & division. Combinations. Sequences. Factors and multiples. Addition & subtraction. Interactivities. Working systematically. Investigations. Trial and improvement.
Published October 2000.
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