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?
Between midnight and 7:00 we found ten
There are no times between
7:00 and midday .
We found two times between midday and midnight. These are
12:34 and 23:45.
School and Community College) agrees with this answer and makes a
statement about why you don't get times containing a 7, 8, or 9 in
The largest the tens digit of the minute number can be is 5, so
the largest unit of the hour number is 6 in order for the time to
have consecutive digits.
Primary School, Leeds) also solved this one and explained his
Middle School, Dunstable) took a different view of this problem.
Instead of only looking at single digit numbers, he also looked for
consecutive two-digit numbers. This is what he found:
Some interesting patterns here Jason!