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On a digital clock showing $24$-hour time, over a whole day, how many times does a $5$ appear?
Is it the same number for a $12$-hour clock over a whole day?
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!
This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.
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?