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Which times on a digital clock have a line of symmetry? Which look the same upside-down? You might like to try this investigation and find out!

Penta Play

A shape and space game for 2, 3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board.


These clocks have been reflected in a mirror. What times do they say?

Transformation Tease

Age 7 to 11
Challenge Level

After each transformation (translation, reflection or rotation), look at each point and ask yourself:

  • What has happened to the x coordinate?
  • What has happened to the y coordinate?