Stage: 1 Challenge Level: 
It might help to have labelled counters with the five symbols $+ , -, \times , \div$ and $ =$ on them, which you can move around on this sheet.
Interactivities. Multiplication & division. Visualising. Games. Combinations. Trial and improvement. Addition & subtraction. Working systematically. Practical Activity. Inverses.
Published November 2009,December 2009.
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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