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
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?
On a digital $24$ hour clock, at certain times, all the digits
are consecutive (in counting order). You can count forwards or
For example, 1:23 or
How many times like this are there between midnight and
How many are there between 7:00 and midday?
How many are there between midday and midnight?