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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!

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Clock Hands

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

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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?

Three of a Kind

Stage: 2 and 3 Short Challenge Level: Challenge Level:1
316 minutes will pass, as the digits will next be all the same at 11.11, i.e. in 5 hours and 16 minutes time.

This problem is taken from the UKMT Mathematical Challenges.
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