How many times in twelve hours do the hands of a clock form a right
angle? Use the interactivity to check your answers.
Which segment on a digital clock is lit most each day? Which
segment is lit least? Does it make any difference if it is set to
12 hours or 24 hours?
Sometime during every hour the minute hand lies directly above the hour hand. At what time between 4 and 5 o'clock does this happen?
Follow the journey taken by this bird and let us know for how long
and in what direction it must fly to return to its starting point.
Use your knowledge of angles to work out how many degrees the hour
and minute hands of a clock travel through in different amounts of
During the third hour after midnight the hands on a clock point in
the same direction (so one hand is over the top of the other). At
what time, to the nearest second, does this happen?
Noticing the regular movement of the Sun and the stars has led to a desire to measure time. This article for teachers and learners looks at the history of man's need to measure things.
Stuart's watch loses two minutes every hour. Adam's watch gains one
minute every hour. Use the information to work out what time (the
real time) they arrived at the airport.
A game for two or more players that uses a knowledge of measuring
tools. Spin the spinner and identify which jobs can be done with
the measuring tool shown.
On a digital clock showing 24 hour time, over a whole day, how many
times does a 5 appear? Is it the same number for a 12 hour clock
over a whole day?
Look at the changes in results on some of the athletics track events at the Olympic Games in 1908 and 1948. Compare the results for 2012.
This article explains how Greenwich Mean Time was established and in fact, why Greenwich in London was chosen as the standard.
Use the interactivity to move Mr Pearson and his dog. Can you move
him so that the graph shows a curve?
Use the clocks to investigate French decimal time in this problem.
Can you see how this time system worked?
Can you create a story that would describe the movement of the man
shown on these graphs? Use the interactivity to try out our ideas.
Can you rank these quantities in order? You may need to find out
extra information or perform some experiments to justify your
These clocks have only one hand, but can you work out what time
they are showing from the information?
Can you order pictures of the development of a frog from frogspawn
and of a bean seed growing into a plant?
On a digital 24 hour clock, at certain times, all the digits are consecutive. How many times like this are there between midnight and 7 a.m.?
This month there is a Friday the thirteenth and this year there are three. Can you explain why every year must contain at least one Friday the thirteenth?
Galileo, a famous inventor who lived about 400 years ago, came up
with an idea similar to this for making a time measuring
instrument. Can you turn your pendulum into an accurate minute
I found these clocks in the Arts Centre at the University of
Warwick intriguing - do they really need four clocks and what times
would be ambiguous with only two or three of them?
My cousin was 24 years old on Friday April 5th in 1974. On what day
of the week was she born?
These two challenges will test your time-keeping!
What can you say about when these pictures were taken?
Can you put these times on the clocks in order? You might like to arrange them in a circle.
Can you put these mixed-up times in order? You could arrange them in a circle.
This investigation explores using different shapes as the hands of
the clock. What things occur as the the hands move.
Can you place these quantities in order from smallest to largest?
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?
If it takes four men one day to build a wall, how long does it take
60,000 men to build a similar wall?
Great Granddad is very proud of his telegram from the Queen
congratulating him on his hundredth birthday and he has friends who
are even older than he is... When was he born?
Not everybody agreed that the Third Millennium actually began on January 1st 2000. Find out why by reading this brief article.
Measure problems at primary level that require careful consideration.
Measure problems at primary level that may require determination.
These clocks have been reflected in a mirror. What times do they
A bus route has a total duration of 40 minutes. Every 10 minutes,
two buses set out, one from each end. How many buses will one bus
meet on its way from one end to the other end?
Two engines, at opposite ends of a single track railway line, set
off towards one another just as a fly, sitting on the front of one
of the engines, sets off flying along the railway line...
Measure problems for inquiring primary learners.
Measure problems for primary learners to work on with others.
Chandrika was practising a long distance run. Can you work out how
long the race was from the information?
The pages of my calendar have got mixed up. Can you sort them out?
At the time of writing the hour and minute hands of my clock are at
right angles. How long will it be before they are at right angles
Liitle Millennium Man was born on Saturday 1st January 2000 and he will retire on the first Saturday 1st January that occurs after his 60th birthday. How old will he be when he retires?
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
What is the date in February 2002 where the 8 digits are
palindromic if the date is written in the British way?
A paradox is a statement that seems to be both untrue and true at the same time. This article looks at a few examples and challenges you to investigate them for yourself.
In this matching game, you have to decide how long different events take.
Calendars were one of the earliest calculating devices developed by civilizations. Find out about the Mayan calendar in this article.
Read this article to find out the mathematical method for working out what day of the week each particular date fell on back as far as 1700.