Stage: 1 Challenge Level: 
Some toy ladybirds are kept in this box which has 9 little square compartments.
Can you place six ladybirds into the box so that there are just two ladybirds in every column and every row?
You could try this interactivity.
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Investigations. Trial and improvement. Games. Combinations. Visualising. Multiplication & division. Working systematically. Addition & subtraction. Practical Activity. Interactivities.
Published February 1999,October 2008.
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