Stage: 1 Challenge Level: 
Can you find a path from a number at the top of this network to the bottom which goes through each of the numbers $1$ to $9$ once and once only?
Working systematically. Trial and improvement. Games. Factors and multiples. Visualising. Introducing algebra. Addition & subtraction. Interactivities. Multiplication & division. Counting.
Published February 2002.
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
