You may also like

problem icon


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!

problem icon

Clock Hands

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

problem icon

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?


Age 7 to 11 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?

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.