Stage: 2 Short Challenge Level: 
How can you get from the first to the second number?
Will that work when going from the second to the third too?
Will that work when going from the second to the third too?
Multiplication & division. Investigations. Generalising. Interactivities. Combinations. Factors and multiples. Working systematically. Addition & subtraction. Trial and improvement. Sequences.
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