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?
This challenge caused a lot of hard thinking.
Some took the time to be around 2.10 and others around 3.15
according to how they interpreted the question. Either way led to
some careful working out. The amount the small hour hand moves led
to slightly different suggested answers.
Hasa, Javeria and Sarah
Isobel sent in her suggestion