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.

Dominoes with nine spots

A normal set of dominoes has 28 tiles and the largest is "double six." This special domino set has more tiles and the largest is "double nine." How many tiles does it have?

You can buy domino sets going up to "double twelve." How many tiles would these sets have?

A normal set of dominoes can be matched up to make a continuous chain that uses all the tiles. Why is this impossible with the set in the photograph?


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.