### Times

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 find out!

### Clock Hands

This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.

### Ten Green Bottles

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?

# Timing

##### Stage: 2 Short Challenge Level:

Office on Time:
Tom and John have to be in their offices each day at 9 a.m..
To be on time, they have to catch the 8 o'clock bus; so they have to reach the bus stop 2 or 3 minutes before 8 o'clock.
Tom's watch is 10 minutes fast but he thinks it is 5 minutes slow.
John's watch is 5 minutes slow but he thinks it is 10 minutes fast.
Will both of them get to their offices on time?

Hawaii:
During his holidays in Hawaii George met a young man who told him, "The day before yesterday I was 25 and next year I will be 28."

Is it possible and if so what date did they meet?

These two problems were suggested by Lim Yi Jia from The Chinese High School, Singapore.