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?
Only Tom will catch the bus to work. He will arrive at $7.42$ if
he wants to get there $3$ minutes early. John will get there at
$8.12$ if he wants to get there $3$ minutes early. This is because,
say the exact time was $7.50$ by Tom's watch it would be $8.00$,
but he thinks this is $5$ minutes slow, so he would believe the
time was $8.05$. This gives him 15 minutes so if he wanted to
arrive at the bus stop at $7.57$ by his watch, the actual time
would be $7.57 - 15$ minutes $ = 7.42$. The same happens for John
but in the opposite way therefore he arrives $15$ minutes later, at
$8.12$. (Steve, Bedlington High School, Northumberland)
Well done Suzanne, Helen, Charis, Lyndsay,
Nisha and Christiane from The Mount School York, and others from
The Mount School and especially Christiane who did the time line.
Well done also to Kang Hong from The Chinese High School,
Singapore, Laura, Ipswich High School; James, Hethersettt High
School, Norwich; Alan, Bedlington High School, Northumberland.