There are **89** NRICH Mathematical resources connected to **Time**, you may find related items under Measuring and calculating with units.

Try this matching game which will help you recognise different ways of saying the same time interval.

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.

Can you put these mixed-up times in order? You could arrange them in a circle.

Can you put these times on the clocks in order? You might like to arrange them in a circle.

Can you place these quantities in order from smallest to largest?

These pictures show some different activities that you may get up to during a day. What order would you do them in?

Try this version of Snap with a friend - do you know the order of the days of the week?

This is a game for two players. Can you find out how to be the first to get to 12 o'clock?

My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.

These clocks have only one hand, but can you work out what time they are showing from the information?

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...

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?

A train leaves on time. After it has gone 8 miles (at 33mph) the driver looks at his watch and sees that the hour hand is exactly over the minute hand. When did the train leave the station?

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?

A messenger runs from the rear to the head of a marching column and back. When he gets back, the rear is where the head was when he set off. What is the ratio of his speed to that of the column?

These clocks have been reflected in a mirror. What times do they say?

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.

How far have these students walked by the time the teacher's car reaches them after their bus broke down?

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.?

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?

If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?

Children use everyday language to talk about time, to compare quantities and to solve problems

This activity encourages children to think about times of day and the order in which they do different activities throughout the day.

Measure problems at primary level that may require resilience.

Measure problems at primary level that require careful consideration.

Measure problems for primary learners to work on with others.

Measure problems for inquiring primary learners.

How long does it take to brush your teeth? Can you find the matching length of time?

The pages of my calendar have got mixed up. Can you sort them out?

Stop the Clock game for an adult and child. How can you make sure you always win this game?

In this task, children will practise using a variety of timers to work out how many items they can put into a jar before the time finishes.

If Tom wants to learn to cook his favourite supper, he needs to make a schedule so that everything is ready at the same time.

Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?

Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?

Can you rank these quantities in order? You may need to find out extra information or perform some experiments to justify your rankings.

This article for teachers suggests ideas for activities built around 10 and 2010.

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 humanity's need to measure things.

Investigate the different distances of these car journeys and find out how long they take.

This article for teachers suggests ways in which dinosaurs can be a great context for discussing measurement.

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?

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 timer?

This article explains how Greenwich Mean Time was established and in fact, why Greenwich in London was chosen as the standard.

Use the clocks to investigate French decimal time in this problem. Can you see how this time system worked?

Describe what Emma might be doing from these pictures of clocks which show important times in her day.

Use the interactivity to move Mr Pearson and his dog. Can you move him so that the graph shows a curve?

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.

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 time.