Problem Pictures
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PP1 CD-ROM cover

This picture is taken from the Problem Pictures CD-ROM of photographs with activities for mathematics teaching.

Dividing plate

This plate is designed to help you cut a round cake or pie into equal pieces. Imagine that you place your cake in the middle of the plate. If you wanted nine pieces, you would cut at all the positions marked "9" and also at the position marked "0".

The plate is called a plat diviseur and comes from Brittany in France.

The plate lets you divide into 3, 5, 6, 7, or 9 pieces. Why do you think 2, 4, and 8 have been left out?

Make your own design for a dividing plate.


The photographs and screen images on this website are copyright and may not be reproduced without permission.Copyright Richard Phillips 2001/2008. Page updated 27 November 2008.