Other tags that relate to Dotty Relationship
Visualising. Squares. Angles - points, lines and parallel lines. Coordinates. GeoGebra. History. Time. Interactivities. Rotations. Angle properties of polygons.There are 67 results
Broad Topics > Measuring and calculating with units > Time
Take the Right Angle
Age 7 to 11 Challenge Level:
How many times in twelve hours do the hands of a clock form a right angle? Use the interactivity to check your answers.
Sweeping Hands
Age 7 to 11 Challenge Level:
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.
John's Train Is on Time
Age 11 to 14 Challenge Level:
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?
Calendars
Age 5 to 14
Calendars were one of the earliest calculating devices developed by civilizations. Find out about the Mayan calendar in this article.
On Time?
Age 5 to 14
This article explains how Greenwich Mean Time was established and in fact, why Greenwich in London was chosen as the standard.
An Unhappy End
Age 11 to 14 Challenge Level:
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...
Digital Times
Age 11 to 14 Challenge Level:
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?
Clock Hands
Age 7 to 11 Challenge Level:
This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.
Buses
Age 11 to 14 Challenge Level:
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?
Clocking Off
Age 7 to 16 Challenge Level:
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?
Walk and Ride
Age 7 to 14 Challenge Level:
How far have these students walked by the time the teacher's car reaches them after their bus broke down?
Two Clocks
Age 7 to 11 Challenge Level:
These clocks have only one hand, but can you work out what time they are showing from the information?
Clocks
Age 7 to 11 Challenge Level:
These clocks have been reflected in a mirror. What times do they say?
What Is the Time?
Age 5 to 11 Challenge Level:
Can you put these times on the clocks in order? You might like to arrange them in a circle.
Crossing the Atlantic
Age 11 to 14 Challenge Level:
Every day at noon a boat leaves Le Havre for New York while another boat leaves New York for Le Havre. The ocean crossing takes seven days. How many boats will each boat cross during their journey?
Hello Again
Age 11 to 14 Challenge Level:
Anne completes a circuit around a circular track in 40 seconds. Brenda runs in the opposite direction and meets Anne every 15 seconds. How long does it take Brenda to run around the track?
A Brief History of Time Measurement
Age 11 to 18
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.
How Long Does it Take?
Age 7 to 11 Challenge Level:
How long does it take to brush your teeth? Can you find the matching length of time?
A History of Astronomy
Age 7 to 11
Astronomy grew out of problems that the early civilisations had. They needed to solve problems relating to time and distance - both mathematical topics.
How Many Times?
Age 7 to 11 Challenge Level:
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.?
Paradoxes
Age 7 to 14
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.
Rule of Three
Age 11 to 14 Challenge Level:
If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?
The New Millennium: When Did it Begin?
Age 7 to 11
Not everybody agreed that the Third Millennium actually began on January 1st 2000. Find out why by reading this brief article.
A Child Is Full of ...
Age 7 to 11 Short Challenge Level:
My cousin was 24 years old on Friday April 5th in 1974. On what day of the week was she born?
N Is a Number
Age 11 to 14 Challenge Level:
N people visit their friends staying N kilometres along the coast. Some walk along the cliff path at N km an hour, the rest go by car. How long is the road?
Wonky Watches
Age 7 to 11 Challenge Level:
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.
Making Maths: Make a Pendulum
Age 7 to 14 Challenge Level:
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?
Ten Green Bottles
Age 7 to 11 Challenge Level:
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?
2010: A Year of Investigations
Age 5 to 14
This article for teachers suggests ideas for activities built around 10 and 2010.
The Time Is ...
Age 7 to 11 Challenge Level:
Can you put these mixed-up times in order? You could arrange them in a circle.
On What Day Did it Happen?
Age 5 to 14
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.
Order the Changes
Age 7 to 11 Challenge Level:
Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?
Calendar Sorting
Age 7 to 11 Challenge Level:
The pages of my calendar have got mixed up. Can you sort them out?
Friday 13th
Age 11 to 14 Challenge Level:
Can you explain why every year must contain at least one Friday the thirteenth?
Do You Measure Up?
Age 7 to 11 Challenge Level:
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.
Millennium Man
Age 7 to 11 Challenge Level:
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?
Decimal Time
Age 11 to 14 Challenge Level:
Use the clocks to investigate French decimal time in this problem. Can you see how this time system worked?
A Calendar Question
Age 7 to 11 Challenge Level:
July 1st 2001 was on a Sunday. July 1st 2002 was on a Monday. When did July 1st fall on a Monday again?
A Flying Holiday
Age 7 to 11 Short Challenge Level:
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.
Watch the Clock
Age 7 to 11 Challenge Level:
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?
Slow Coach
Age 7 to 11 Challenge Level:
How many of this company's coaches travelling in the opposite direction does the 10 am coach from Alphaton pass before reaching Betaville?
Train Timetable
Age 7 to 11 Challenge Level:
Use the information to work out the timetable for the three trains travelling between City station and Farmland station.
All in a Jumble
Age 11 to 14 Challenge Level:
My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.
5 on the Clock
Age 7 to 11 Challenge Level:
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?
Home Time
Age 7 to 11 Challenge Level:
Alice's mum needs to go to each child's house just once and then back home again. How many different routes are there? Use the information to find out how long each road is on the route she took.
Palindromic Date
Age 7 to 11 Challenge Level:
What is the date in February 2002 where the 8 digits are palindromic if the date is written in the British way?
Times
Age 7 to 11 Challenge Level:
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!
NRICH is part of the family of activities in the Millennium Mathematics Project.