Find the frequency distribution for ordinary English, and use it to help you crack the code.
Can you coach your rowing eight to win?
A game in which players take it in turns to choose a number. Can you block your opponent?
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
Is this a fair game? How many ways are there of creating a fair
game by adding odd and even numbers?
Can you find a relationship between the number of dots on the
circle and the number of steps that will ensure that all points are
A card pairing game involving knowledge of simple ratio.
Can you complete this jigsaw of the multiplication square?
Meg and Mo still need to hang their marbles so that they balance,
but this time the constraints are different. Use the interactivity
to experiment and find out what they need to do.
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...
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
This article gives you a few ideas for understanding the Got It! game and how you might find a winning strategy.
How many different triangles can you make which consist of the
centre point and two of the points on the edge? Can you work out
each of their angles?
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Could games evolve by natural selection? Take part in this web experiment to find out!
Meg and Mo need to hang their marbles so that they balance. Use the
interactivity to experiment and find out what they need to do.
Use the interactivity to create some steady rhythms. How could you
create a rhythm which sounds the same forwards as it does
An animation that helps you understand the game of Nim.
An environment which simulates working with Cuisenaire rods.
A collection of resources to support work on Factors and Multiples at Secondary level.
Can you find a reliable strategy for choosing coordinates that will locate the robber in the minimum number of guesses?
Interactive game. Set your own level of challenge, practise your table skills and beat your previous best score.
Ahmed has some wooden planks to use for three sides of a rabbit run
against the shed. What quadrilaterals would he be able to make with
the planks of different lengths?
Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?
Practise your diamond mining skills and your x,y coordination in this homage to Pacman.
An interactive activity for one to experiment with a tricky tessellation
A game for 2 people that everybody knows. You can play with a
friend or online. If you play correctly you never lose!
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
Can you spot the similarities between this game and other games you know? The aim is to choose 3 numbers that total 15.
A game for 2 players that can be played online. Players take it in turns to select a word from the 9 words given. The aim is to select all the occurrences of the same letter.
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
A game for 2 people that can be played on line or with pens and paper. Combine your knowledege of coordinates with your skills of strategic thinking.
An interactive game for 1 person. You are given a rectangle with 50 squares on it. Roll the dice to get a percentage between 2 and 100. How many squares is this? Keep going until you get 100. . . .
What are the coordinates of the coloured dots that mark out the
tangram? Try changing the position of the origin. What happens to
the coordinates now?
What can you say about the values of n that make $7^n + 3^n$ a multiple of 10? Are there other pairs of integers between 1 and 10 which have similar properties?
Learn how to use the Shuffles interactivity by running through these tutorial demonstrations.
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
Mr McGregor has a magic potting shed. Overnight, the number of
plants in it doubles. He'd like to put the same number of plants in
each of three gardens, planting one garden each day. Can he do it?
A generic circular pegboard resource.
What is the relationship between the angle at the centre and the
angles at the circumference, for angles which stand on the same
arc? Can you prove it?
You have 27 small cubes, 3 each of nine colours. Use the small cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of every colour.
Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!
Imagine a wheel with different markings painted on it at regular
intervals. Can you predict the colour of the 18th mark? The 100th
Can you locate the lost giraffe? Input coordinates to help you
search and find the giraffe in the fewest guesses.
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
A game for 1 person to play on screen. Practise your number bonds
whilst improving your memory
7 balls are shaken in a container. You win if the two blue balls
touch. What is the probability of winning?
Here is a chance to play a version of the classic Countdown Game.
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?