Other tags that relate to Timing
Temperature. Mass and weight. Working systematically. Clock. Addition & subtraction. Length/distance. Angles - points, lines and parallel lines. Speed and acceleration. Calendars. Time.There are 342 results
Broad Topics > Thinking Mathematically > Working systematically
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?
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.
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.
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?
Calendar Sorting
Age 7 to 11
Challenge Level
The pages of my calendar have got mixed up. Can you sort them out?
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?
Colour in the Square
Age 7 to 16
Challenge Level
Can you put the 25 coloured tiles into the 5 x 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?
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?
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.?
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?
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?
Finding Fifteen
Age 7 to 11
Challenge Level
Tim had nine cards each with a different number from 1 to 9 on it. How could he have put them into three piles so that the total in each pile was 15?
An Introduction to Magic Squares
Age 7 to 16
Find out about Magic Squares in this article written for students. Why are they magic?!
Ben's Game
Age 11 to 16
Challenge Level
Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?
Twin Corresponding Sudokus II
Age 11 to 16
Challenge Level
Two sudokus in one. Challenge yourself to make the necessary connections.
Geoboards
Age 7 to 11
Challenge Level
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
Peaches Today, Peaches Tomorrow...
Age 11 to 14
Challenge Level
A monkey with peaches, keeps a fraction of them each day, gives the rest away, and then eats one. How long can his peaches last?
Integrated Sums Sudoku
Age 11 to 16
Challenge Level
The puzzle can be solved with the help of small clue-numbers which are either placed on the border lines between selected pairs of neighbouring squares of the grid or placed after slash marks on. . . .
Fence It
Age 11 to 14
Challenge Level
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
Shaping Up
Age 7 to 11
Challenge Level
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
Nine-pin Triangles
Age 7 to 11
Challenge Level
How many different triangles can you make on a circular pegboard that has nine pegs?
Folded Number Line
Age 7 to 11
Challenge Level
When I fold a 0-20 number line, I end up with 'stacks' of numbers on top of each other. These challenges involve varying the length of the number line and investigating the 'stack totals'.
Arrangements
Age 7 to 11
Challenge Level
Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?
Putting Two and Two Together
Age 7 to 11
Challenge Level
In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?
More on Mazes
Age 7 to 14
There is a long tradition of creating mazes throughout history and across the world. This article gives details of mazes you can visit and those that you can tackle on paper.
Quadruple Clue Sudoku
Age 11 to 16
Challenge Level
Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.
Another Quadruple Clue Sudoku
Age 11 to 16
Challenge Level
This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.
Star Product Sudoku
Age 11 to 16
Challenge Level
The puzzle can be solved by finding the values of the unknown digits (all indicated by asterisks) in the squares of the $9\times9$ grid.
Colour Islands Sudoku
Age 11 to 14
Challenge Level
An extra constraint means this Sudoku requires you to think in diagonals as well as horizontal and vertical lines and boxes of nine.
Two Egg Timers
Age 7 to 11
Challenge Level
You have two egg timers. One takes 4 minutes exactly to empty and the other takes 7 minutes. What times in whole minutes can you measure and how?
Cubes Here and There
Age 7 to 11
Challenge Level
How many shapes can you build from three red and two green cubes? Can you use what you've found out to predict the number for four red and two green?
Tiling
Age 7 to 11
Challenge Level
An investigation that gives you the opportunity to make and justify predictions.
The Puzzling Sweet Shop
Age 5 to 11
Challenge Level
There were chews for 2p, mini eggs for 3p, Chocko bars for 5p and lollypops for 7p in the sweet shop. What could each of the children buy with their money?
Dodecamagic
Age 7 to 11
Challenge Level
Here you see the front and back views of a dodecahedron. Each vertex has been numbered so that the numbers around each pentagonal face add up to 65. Can you find all the missing numbers?
Quadruple Sudoku
Age 11 to 16
Challenge Level
Four small numbers give the clue to the contents of the four surrounding cells.
Centred Squares
Age 7 to 11
Challenge Level
This challenge, written for the Young Mathematicians' Award, invites you to explore 'centred squares'.
Dice Stairs
Age 7 to 11
Challenge Level
Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?
Being Resourceful - Primary Number
Age 5 to 11
Challenge Level
Number problems at primary level that require careful consideration.
Pole Star Sudoku 2
Age 11 to 16
Challenge Level
This Sudoku, based on differences. Using the one clue number can you find the solution?
Consecutive Negative Numbers
Age 11 to 14
Challenge Level
Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?
Dart Target
Age 7 to 11
Challenge Level
This task, written for the National Young Mathematicians' Award 2016, invites you to explore the different combinations of scores that you might get on these dart boards.
Open Squares
Age 7 to 11
Challenge Level
This task, written for the National Young Mathematicians' Award 2016, focuses on 'open squares'. What would the next five open squares look like?
Polydron
Age 7 to 11
Challenge Level
This activity investigates how you might make squares and pentominoes from Polydron.
Magnetic Personality
Age 7 to 16
Challenge Level
60 pieces and a challenge. What can you make and how many of the pieces can you use creating skeleton polyhedra?
Multiples Grid
Age 7 to 11
Challenge Level
What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?
Symmetry Challenge
Age 7 to 11
Challenge Level
Systematically explore the range of symmetric designs that can be created by shading parts of the motif below. Use normal square lattice paper to record your results.
NRICH is part of the family of activities in the Millennium Mathematics Project.