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!
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
Twenty four games for the run-up to Christmas.
A card pairing game involving knowledge of simple ratio.
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 happens when you try and fit the triomino pieces into these
Imagine a wheel with different markings painted on it at regular
intervals. Can you predict the colour of the 18th mark? The 100th
Move just three of the circles so that the triangle faces in the
Can you cover the camel with these pieces?
Choose 13 spots on the grid. Can you work out the scoring system? What is the maximum possible score?
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.
Choose a symbol to put into the number sentence.
Complete the squares - but be warned some are trickier than they
Use the clues to colour each square.
Match the halves.
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
A generic circular pegboard resource.
Can you make a cycle of pairs that add to make a square number
using all the numbers in the box below, once and once only?
Use the interactivity to find out how many quarter turns the man
must rotate through to look like each of the pictures.
Play this well-known game against the computer where each player is
equally likely to choose scissors, paper or rock. Why not try the
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?
If you have only four weights, where could you place them in order
to balance this equaliser?
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?
An odd version of tic tac toe
A game for 2 people that everybody knows. You can play with a
friend or online. If you play correctly you never lose!
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10
Work out the fractions to match the cards with the same amount of
Hover your mouse over the counters to see which ones will be
removed. Click to remover them. The winner is the last one to
remove a counter. How you can make sure you win?
An interactive activity for one to experiment with a tricky tessellation
Can you complete this jigsaw of the multiplication square?
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?
Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?
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?
Train game for an adult and child. Who will be the first to make the train?
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
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.
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
Using angular.js to bind inputs to outputs
A train building game for 2 players.
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?
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
Use your mouse to move the red and green parts of this disc. Can
you make images which show the turnings described?
A game for 1 or 2 people. Use the interactive version, or play with friends. Try to round up as many counters as possible.
Use the interactivity to create some steady rhythms. How could you
create a rhythm which sounds the same forwards as it does
Use the Cuisenaire rods environment to investigate ratio. Can you
find pairs of rods in the ratio 3:2? How about 9:6?
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
A tetromino is made up of four squares joined edge to edge. Can
this tetromino, together with 15 copies of itself, be used to cover
an eight by eight chessboard?
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?
Can you find just the right bubbles to hold your number?
Exchange the positions of the two sets of counters in the least possible number of moves