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?
Yu Wang from Bern in Switzerland sent this:
The tortoise takes 2 hrs 30 mins to complete the race. Divide
that by 10 to give you 15 mins (this is how long the hare takes),
substract 15 mins from 2 hrs 30mins and then add the 30 seconds
because the hare finishes 30 seconds after the tortoise.
T (hare ) = 2 hrs 30 mins 30 secs -15 mins So, the hare sleeps
for 2 hours 15 minutes and 30 seconds.