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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!

Clock Hands

This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.

Ten Green Bottles

Do you know the rhyme about ten green bottles hanging on a wall? If the first bottle fell at ten past five and the others fell down at 5 minute intervals, what time would the last bottle fall down?

Clocking Off

Age 7 to 16 Challenge Level:

Four clocks in a row

These clocks can be found in the Arts Centre at the University of Warwick.

What was the time when I took this picture?

If I hid one of the clocks would you still be able to tell the time?
Would it make a difference which clock I covered?
Would there be periods of the day when I could not work out the time if there were only three clocks and what would those periods be for different combinations of three clocks?

Below are some pictures of just two of the clocks. What periods during the day would you not be sure of the time in each case?
Two clocks
View of two clocks

View of two clocks