An odd version of tic tac toe
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
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?
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?
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
Play this well-known game against the computer where each player is
equally likely to choose scissors, paper or rock. Why not try the
Choose 13 spots on the grid. Can you work out the scoring system? What is the maximum possible score?
If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?
Match the halves.
Twenty four games for the run-up to Christmas.
This was a problem for our birthday website. Can you use four of these pieces to form a square? How about making a square with all five pieces?
A generic circular pegboard resource.
A train building game for 2 players.
A game for 2 people that everybody knows. You can play with a
friend or online. If you play correctly you never lose!
You'll need two dice to play this game against a partner. Will Incey Wincey make it to the top of the drain pipe or the bottom of the drain pipe first?
Take it in turns to place a domino on the grid. One to be placed horizontally and the other vertically. Can you make it impossible for your opponent to play?
Using angular.js to bind inputs to outputs
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. . . .
An interactive activity for one to experiment with a tricky tessellation
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.
Use the interactivity to find out how many quarter turns the man
must rotate through to look like each of the pictures.
Complete the squares - but be warned some are trickier than they
A card pairing game involving knowledge of simple ratio.
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
Move just three of the circles so that the triangle faces in the
Find out how we can describe the "symmetries" of this triangle and
investigate some combinations of rotating and flipping it.
What does the overlap of these two shapes look like? Try picturing
it in your head and then use the interactivity to test your
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
An interactive game to be played on your own or with friends.
Imagine you are having a party. Each person takes it in turns to
stand behind the chair where they will get the most chocolate.
Use your mouse to move the red and green parts of this disc. Can
you make images which show the turnings described?
The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?
Imagine a wheel with different markings painted on it at regular
intervals. Can you predict the colour of the 18th mark? The 100th
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
A game to be played against the computer, or in groups. Pick a 7-digit number. A random digit is generated. What must you subract to remove the digit from your number? the first to zero wins.
You have 4 red and 5 blue counters. How many ways can they be
placed on a 3 by 3 grid so that all the rows columns and diagonals
have an even number of red counters?
Watch this film carefully. Can you find a general rule for
explaining when the dot will be this same distance from the
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
Can you find just the right bubbles to hold your number?
Can you sort these triangles into three different families and explain how you did it?
Take it in turns to make a triangle on the pegboard. Can you block your opponent?
Use the interactivity to sort these numbers into sets. Can you give
each set a name?
A simulation of target archery practice
Can you make the green spot travel through the tube by moving the
yellow spot? Could you draw a tube that both spots would follow?
Use the blue spot to help you move the yellow spot from one star to
the other. How are the trails of the blue and yellow spots related?
Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?
Use the Cuisenaire rods environment to investigate ratio. Can you
find pairs of rods in the ratio 3:2? How about 9:6?
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
If you can post the triangle with either the blue or yellow colour face up, how many ways can it be posted altogether?
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!